diff --git a/static/app/actionCreators/dashboards.tsx b/static/app/actionCreators/dashboards.tsx
index 7f50ea08fc6531..940c96c6a14f81 100644
--- a/static/app/actionCreators/dashboards.tsx
+++ b/static/app/actionCreators/dashboards.tsx
@@ -12,6 +12,7 @@ import {defined} from 'sentry/utils';
 import {getApiUrl} from 'sentry/utils/api/getApiUrl';
 import {TOP_N} from 'sentry/utils/discover/types';
 import {fetchMutation} from 'sentry/utils/queryClient';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {getStarredDashboardsQueryKey} from 'sentry/views/dashboards/hooks/useGetStarredDashboards';
 import {
   DashboardFilter,
@@ -38,7 +39,8 @@ export function fetchDashboards(
   );
 
   promise.catch(response => {
-    const errorResponse = response?.responseJSON ?? null;
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
 
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
@@ -82,7 +84,8 @@ export function createDashboard(
   );
 
   promise.catch(response => {
-    const errorResponse = response?.responseJSON ?? null;
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
 
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
@@ -166,8 +169,9 @@ export async function updateDashboardFavorite(
       queryKey: getStarredDashboardsQueryKey(organization),
     });
     addSuccessMessage(isFavorited ? t('Added as favorite') : t('Removed as favorite'));
-  } catch (response: any) {
-    const errorResponse = response?.responseJSON ?? null;
+  } catch (response) {
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
       addErrorMessage(errors[Object.keys(errors)[0]!]! as string);
@@ -193,7 +197,8 @@ export function fetchDashboard(
   );
 
   promise.catch(response => {
-    const errorResponse = response?.responseJSON ?? null;
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
 
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
@@ -248,7 +253,8 @@ export function updateDashboard(
   // that it can be more specific than just "Dashboard updated," but do the
   // error-handling here, since it doesn't depend on the caller's context
   promise.catch(response => {
-    const errorResponse = response?.responseJSON ?? null;
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
 
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
@@ -281,7 +287,8 @@ export function deleteDashboard(
   });
 
   promise.catch(response => {
-    const errorResponse = response?.responseJSON ?? null;
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
 
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
@@ -335,7 +342,8 @@ export function updateDashboardPermissions(
   );
 
   promise.catch(response => {
-    const errorResponse = response?.responseJSON ?? null;
+    const errorResponse =
+      response instanceof RequestError ? response?.responseJSON : null;
 
     if (errorResponse) {
       const errors = flattenErrors(errorResponse, {});
diff --git a/static/app/actionCreators/integrations.tsx b/static/app/actionCreators/integrations.tsx
index c608c0c0365a63..f43b4ad8b02eba 100644
--- a/static/app/actionCreators/integrations.tsx
+++ b/static/app/actionCreators/integrations.tsx
@@ -66,7 +66,7 @@ function applyRepositoryAddComplete(promise: Promise<Repository>) {
       });
       addSuccessMessage(message);
     },
-    errorData => {
+    (errorData: any) => {
       const text = errorData.responseJSON.errors
         ? errorData.responseJSON.errors.__all__
         : t('Unable to add repository.');
diff --git a/static/app/actionCreators/performance.tsx b/static/app/actionCreators/performance.tsx
index 2e57ab42cfff0d..72591a959c6359 100644
--- a/static/app/actionCreators/performance.tsx
+++ b/static/app/actionCreators/performance.tsx
@@ -6,6 +6,7 @@ import {
 import type {Client} from 'sentry/api';
 import {t} from 'sentry/locale';
 import {parseLinkHeader} from 'sentry/utils/parseLinkHeader';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 
 type KeyTransaction = {
   project_id: string;
@@ -96,13 +97,17 @@ export function toggleKeyTransaction(
   promise.then(clearIndicators);
 
   promise.catch(response => {
-    const responseJSON = response?.responseJSON;
-    const errorDetails = responseJSON?.detail ?? responseJSON?.non_field_errors;
-
-    if (Array.isArray(errorDetails) && errorDetails.length && errorDetails[0]) {
-      addErrorMessage(errorDetails[0]);
-    } else {
-      addErrorMessage(errorDetails ?? t('Unable to update key transaction'));
+    if (response instanceof RequestError) {
+      const responseJSON = response?.responseJSON;
+      const errorDetails = responseJSON?.detail ?? responseJSON?.non_field_errors;
+
+      if (Array.isArray(errorDetails) && errorDetails.length && errorDetails[0]) {
+        addErrorMessage(errorDetails[0]);
+      } else if (typeof errorDetails === 'string') {
+        addErrorMessage(errorDetails);
+      } else {
+        addErrorMessage(t('Unable to update key transaction'));
+      }
     }
   });
 
diff --git a/static/app/actionCreators/projects.tsx b/static/app/actionCreators/projects.tsx
index 8fa48a37edcb69..d410d0900aac33 100644
--- a/static/app/actionCreators/projects.tsx
+++ b/static/app/actionCreators/projects.tsx
@@ -15,6 +15,7 @@ import {ProjectsStore} from 'sentry/stores/projectsStore';
 import type {Team} from 'sentry/types/organization';
 import type {Project} from 'sentry/types/project';
 import {apiOptions} from 'sentry/utils/api/apiOptions';
+import type {RequestError} from 'sentry/utils/requestError/requestError';
 import {useApi} from 'sentry/utils/useApi';
 
 type UpdateParams = {
@@ -38,7 +39,7 @@ export function update(api: Client, params: UpdateParams) {
         ProjectsStore.onUpdateSuccess(data);
         return data;
       },
-      err => {
+      (err: Error) => {
         ProjectsStatsStore.onUpdateError(err, params.projectId);
         throw err;
       }
@@ -138,11 +139,11 @@ export function transferProject(
           })
         );
       },
-      err => {
+      (err: RequestError) => {
         let message = '';
         // Handle errors with known failures
-        if (err.status >= 400 && err.status < 500 && err.responseJSON) {
-          message = err.responseJSON?.detail;
+        if (err.status && err.status >= 400 && err.status < 500 && err.responseJSON) {
+          message = err.responseJSON.detail as string;
         }
 
         if (message) {
diff --git a/static/app/actionCreators/release.tsx b/static/app/actionCreators/release.tsx
index 4a073dd85cfb06..ec8faa8f283c5a 100644
--- a/static/app/actionCreators/release.tsx
+++ b/static/app/actionCreators/release.tsx
@@ -6,6 +6,7 @@ import {
 import type {Client} from 'sentry/api';
 import {t} from 'sentry/locale';
 import {ReleaseStatus} from 'sentry/types/release';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 
 type ParamsGet = {
   orgSlug: string;
@@ -31,7 +32,14 @@ export function archiveRelease(api: Client, params: ParamsGet) {
       addSuccessMessage(t('Release was successfully archived.'));
     })
     .catch(error => {
-      addErrorMessage(error.responseJSON?.detail ?? t('Release could not be archived.'));
+      if (
+        error instanceof RequestError &&
+        typeof error.responseJSON?.detail === 'string'
+      ) {
+        addErrorMessage(error.responseJSON?.detail);
+      } else {
+        addErrorMessage(t('Release could not be archived.'));
+      }
       throw error;
     });
 }
@@ -54,7 +62,15 @@ export function restoreRelease(api: Client, params: ParamsGet) {
       addSuccessMessage(t('Release was successfully restored.'));
     })
     .catch(error => {
-      addErrorMessage(error.responseJSON?.detail ?? t('Release could not be restored.'));
+      if (
+        error instanceof RequestError &&
+        typeof error.responseJSON?.detail === 'string'
+      ) {
+        addErrorMessage(error.responseJSON?.detail);
+      } else {
+        addErrorMessage(t('Release could not be restored.'));
+      }
+
       throw error;
     });
 }
diff --git a/static/app/api.tsx b/static/app/api.tsx
index 8af02977da610a..b8c03c01c3383f 100644
--- a/static/app/api.tsx
+++ b/static/app/api.tsx
@@ -648,7 +648,7 @@ export class Client {
           // Not related to errors in responses
         }
       )
-      .catch(error => {
+      .catch((error: Error) => {
         // eslint-disable-next-line no-console
         console.error(error);
 
diff --git a/static/app/components/core/select/async.tsx b/static/app/components/core/select/async.tsx
index 2bbce6f31f1c2e..371d77963ba7ad 100644
--- a/static/app/components/core/select/async.tsx
+++ b/static/app/components/core/select/async.tsx
@@ -65,7 +65,7 @@ class SelectAsyncControl<TData = unknown> extends Component<
   api: Client | null;
   cache: Record<string, unknown>;
 
-  doQuery = debounce((cb: (...args: [RequestError] | [null, TData]) => void) => {
+  doQuery = debounce((cb: (...args: [Error] | [null, TData]) => void) => {
     const {url, onQuery} = this.props;
     const {query} = this.state;
 
@@ -79,7 +79,7 @@ class SelectAsyncControl<TData = unknown> extends Component<
       })
       .then(
         data => cb(null, data),
-        err => cb(err)
+        (err: Error) => cb(err)
       );
   }, 250);
 
diff --git a/static/app/components/exports/useDataExport.ts b/static/app/components/exports/useDataExport.ts
index 627157379f3b73..9e9deb43ba3657 100644
--- a/static/app/components/exports/useDataExport.ts
+++ b/static/app/components/exports/useDataExport.ts
@@ -5,6 +5,7 @@ import type {ResponseMeta} from 'sentry/api';
 import {t} from 'sentry/locale';
 import {getApiUrl} from 'sentry/utils/api/getApiUrl';
 import {downloadFromHref} from 'sentry/utils/downloadFromHref';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {useApi} from 'sentry/utils/useApi';
 import {useOrganization} from 'sentry/utils/useOrganization';
 import {createLogDownloadFilename} from 'sentry/views/explore/logs/createLogDownloadFilename';
@@ -112,13 +113,18 @@ export function useDataExport({
           if (unmountedRef?.current) {
             return;
           }
-          const message =
-            error?.responseJSON?.detail ??
-            t(
-              "We tried our hardest, but we couldn't export your data. Give it another go."
+          if (
+            error instanceof RequestError &&
+            typeof error.responseJSON?.detail === 'string'
+          ) {
+            addErrorMessage(error.responseJSON.detail);
+          } else {
+            addErrorMessage(
+              t(
+                "We tried our hardest, but we couldn't export your data. Give it another go."
+              )
             );
-
-          addErrorMessage(message);
+          }
           inProgressCallback?.(false);
         });
 
diff --git a/static/app/components/forms/model.tsx b/static/app/components/forms/model.tsx
index 80bf4a600d8537..8d709146fc7c77 100644
--- a/static/app/components/forms/model.tsx
+++ b/static/app/components/forms/model.tsx
@@ -532,7 +532,7 @@ export class FormModel {
           this.options.onSubmitSuccess(resp, this);
         }
       })
-      .catch(resp => {
+      .catch((resp: any) => {
         // should we revert field value to last known state?
         saveSnapshot = null;
         if (this.options.resetOnError) {
@@ -648,7 +648,7 @@ export class FormModel {
 
         return data;
       })
-      .catch(resp => {
+      .catch((resp: any) => {
         // should we revert field value to last known state?
         saveSnapshot = null;
 
diff --git a/static/app/components/selectMembers/index.tsx b/static/app/components/selectMembers/index.tsx
index 3efc16645cac22..57afbc6e73d868 100644
--- a/static/app/components/selectMembers/index.tsx
+++ b/static/app/components/selectMembers/index.tsx
@@ -141,7 +141,7 @@ class SelectMembers extends Component<Props, State> {
         })
         .then(
           data => cb(null, data),
-          err => cb(err)
+          err => cb(err as Error)
         );
     },
     250
diff --git a/static/app/types/promise.d.ts b/static/app/types/promise.d.ts
new file mode 100644
index 00000000000000..b04150c2382e44
--- /dev/null
+++ b/static/app/types/promise.d.ts
@@ -0,0 +1,10 @@
+interface Promise<T> {
+  then<TFul = T, TRej = never>(
+    onfulfilled?: ((value: T) => TFul | PromiseLike<TFul>) | null,
+    onrejected?: ((reason: unknown) => TRej | PromiseLike<TRej>) | null
+  ): Promise<TFul | TRej>;
+
+  catch<TRej = never>(
+    onrejected?: ((reason: unknown) => TRej | PromiseLike<TRej>) | null
+  ): Promise<T | TRej>;
+}
diff --git a/static/app/views/alerts/rules/issue/index.tsx b/static/app/views/alerts/rules/issue/index.tsx
index e9f0249e5421a6..5746a62005298a 100644
--- a/static/app/views/alerts/rules/issue/index.tsx
+++ b/static/app/views/alerts/rules/issue/index.tsx
@@ -436,7 +436,7 @@ class IssueRuleEditor extends DeprecatedAsyncComponent<Props, State> {
           success: true,
         });
       })
-      .catch(error => {
+      .catch((error: any) => {
         addErrorMessage(tn('Notification failed', 'Notifications failed', actions));
         this.setState({detailedError: error.responseJSON || null});
         trackAnalytics('edit_alert_rule.notification_test', {
diff --git a/static/app/views/dashboards/detail.tsx b/static/app/views/dashboards/detail.tsx
index cb8abf5b77ece5..120a0af276696e 100644
--- a/static/app/views/dashboards/detail.tsx
+++ b/static/app/views/dashboards/detail.tsx
@@ -894,7 +894,7 @@ class DashboardDetail extends Component<Props, State> {
                   Sentry.captureMessage('Generated dashboard failed to save', {
                     extra: {
                       dashboard_title: newModifiedDashboard.title,
-                      error_message: error?.message,
+                      error_message: error instanceof Error ? error.message : undefined,
                     },
                   });
                 });
diff --git a/static/app/views/dashboards/utils.tsx b/static/app/views/dashboards/utils.tsx
index 77a9bbe7275016..5ac09f54b1c9f8 100644
--- a/static/app/views/dashboards/utils.tsx
+++ b/static/app/views/dashboards/utils.tsx
@@ -327,7 +327,7 @@ export function getWidgetReleasesUrl(
 }
 
 export function flattenErrors(
-  data: ValidationError | string,
+  data: Record<string, unknown> | string,
   update: FlatValidationError
 ): FlatValidationError {
   if (typeof data === 'string') {
diff --git a/static/app/views/discover/table/index.tsx b/static/app/views/discover/table/index.tsx
index 13fa70cafedf8d..91d25606734ae6 100644
--- a/static/app/views/discover/table/index.tsx
+++ b/static/app/views/discover/table/index.tsx
@@ -254,7 +254,7 @@ class Table extends PureComponent<TableProps, TableState> {
           setSplitDecision?.(splitDecision);
         }
       })
-      .catch(err => {
+      .catch((err: any) => {
         metric.measure({
           name: 'app.api.discover-query',
           start: `discover-events-start-${apiPayload.query}`,
diff --git a/static/app/views/explore/profiling/profilesProvider.tsx b/static/app/views/explore/profiling/profilesProvider.tsx
index 2e0b53cf74dee5..3177ae9fce42c2 100644
--- a/static/app/views/explore/profiling/profilesProvider.tsx
+++ b/static/app/views/explore/profiling/profilesProvider.tsx
@@ -147,7 +147,7 @@ export function TransactionProfileProvider({
         setProfile({type: 'resolved', data: p});
       })
       .catch(err => {
-        const message = err.toString();
+        const message = String(err);
 
         setProfile({type: 'errored', error: message});
         Sentry.captureException(err);
diff --git a/static/app/views/performance/transactionSummary/transactionThresholdButton.tsx b/static/app/views/performance/transactionSummary/transactionThresholdButton.tsx
index 6718cb0bb18346..03f1de3866da62 100644
--- a/static/app/views/performance/transactionSummary/transactionThresholdButton.tsx
+++ b/static/app/views/performance/transactionSummary/transactionThresholdButton.tsx
@@ -11,6 +11,7 @@ import type {Organization} from 'sentry/types/organization';
 import type {Project} from 'sentry/types/project';
 import {defined} from 'sentry/utils';
 import type {EventView} from 'sentry/utils/discover/eventView';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {withApi} from 'sentry/utils/withApi';
 import {withProjects} from 'sentry/utils/withProjects';
 
@@ -81,8 +82,9 @@ function TransactionThresholdButton({
           })
           .catch(err => {
             setLoadingThreshold(false);
-            const errorMessage = err.responseJSON?.threshold ?? null;
-            addErrorMessage(errorMessage);
+            const errorMessage =
+              err instanceof RequestError ? err.responseJSON?.threshold : null;
+            addErrorMessage(errorMessage as string);
           });
       });
   }, [api, project, organization.slug, transactionName]);
diff --git a/static/app/views/performance/transactionSummary/transactionThresholdModal.tsx b/static/app/views/performance/transactionSummary/transactionThresholdModal.tsx
index 3b7382ff5a7a36..d6ea927152f798 100644
--- a/static/app/views/performance/transactionSummary/transactionThresholdModal.tsx
+++ b/static/app/views/performance/transactionSummary/transactionThresholdModal.tsx
@@ -17,6 +17,7 @@ import type {Organization} from 'sentry/types/organization';
 import type {Project} from 'sentry/types/project';
 import {defined} from 'sentry/utils';
 import type {EventView} from 'sentry/utils/discover/eventView';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {withApi} from 'sentry/utils/withApi';
 import {withProjects} from 'sentry/utils/withProjects';
 
@@ -91,11 +92,13 @@ function TransactionThresholdModal({
       })
       .catch(err => {
         let errorMessage =
-          err.responseJSON?.threshold ?? err.responseJSON?.non_field_errors ?? null;
+          err instanceof RequestError
+            ? (err.responseJSON?.threshold ?? err.responseJSON?.non_field_errors)
+            : null;
         if (Array.isArray(errorMessage)) {
           errorMessage = errorMessage[0];
         }
-        addErrorMessage(errorMessage);
+        addErrorMessage(errorMessage as string);
       });
   };
 
@@ -139,8 +142,9 @@ function TransactionThresholdModal({
           });
       })
       .catch(err => {
-        const errorMessage = err.responseJSON?.threshold ?? null;
-        addErrorMessage(errorMessage);
+        const errorMessage =
+          err instanceof RequestError ? err.responseJSON?.threshold : null;
+        addErrorMessage(errorMessage as string);
       });
   };
 
diff --git a/static/app/views/settings/account/accountEmails.tsx b/static/app/views/settings/account/accountEmails.tsx
index 5082eaff601746..abd844747ef927 100644
--- a/static/app/views/settings/account/accountEmails.tsx
+++ b/static/app/views/settings/account/accountEmails.tsx
@@ -158,7 +158,7 @@ export function EmailAddresses() {
     api
       .requestPromise(endpoint, requestParams)
       .catch(err => {
-        if (err?.responseJSON?.email) {
+        if (err instanceof RequestError && typeof err?.responseJSON?.email === 'string') {
           addErrorMessage(err.responseJSON.email);
         }
       })
diff --git a/static/app/views/settings/project/projectOwnership/ownerInput.tsx b/static/app/views/settings/project/projectOwnership/ownerInput.tsx
index 889eb3e98cc793..61c3a84d34cbc2 100644
--- a/static/app/views/settings/project/projectOwnership/ownerInput.tsx
+++ b/static/app/views/settings/project/projectOwnership/ownerInput.tsx
@@ -17,6 +17,7 @@ import type {Organization} from 'sentry/types/organization';
 import type {Project} from 'sentry/types/project';
 import {defined} from 'sentry/utils';
 import {trackIntegrationAnalytics} from 'sentry/utils/integrationUtil';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 
 type Props = {
   dateUpdated: string | null;
@@ -87,25 +88,25 @@ export function OwnerInput({
         });
       })
       .catch(caught => {
-        setError(caught.responseJSON);
-        if (caught.status === 403) {
-          addErrorMessage(
-            t(
-              "You don't have permission to modify issue ownership rules for this project"
-            )
-          );
-        } else if (
-          caught.status === 400 &&
-          caught.responseJSON.raw?.[0].startsWith('Invalid rule owners:')
-        ) {
-          addErrorMessage(
-            t(
-              'Unable to save issue ownership rule changes: %s',
-              caught.responseJSON.raw[0]
-            )
-          );
-        } else {
-          addErrorMessage(t('Unable to save issue ownership rule changes'));
+        if (caught instanceof RequestError) {
+          const inputError = caught.responseJSON as InputError;
+          setError(inputError);
+          if (caught.status === 403) {
+            addErrorMessage(
+              t(
+                "You don't have permission to modify issue ownership rules for this project"
+              )
+            );
+          } else if (
+            caught.status === 400 &&
+            inputError.raw?.[0]?.startsWith('Invalid rule owners:')
+          ) {
+            addErrorMessage(
+              t('Unable to save issue ownership rule changes: %s', inputError.raw[0])
+            );
+          } else {
+            addErrorMessage(t('Unable to save issue ownership rule changes'));
+          }
         }
       });
 
diff --git a/static/gsAdmin/components/migrateLegacySeerAction.tsx b/static/gsAdmin/components/migrateLegacySeerAction.tsx
index 28e1af5d20fac1..acf5fe5f49c6dc 100644
--- a/static/gsAdmin/components/migrateLegacySeerAction.tsx
+++ b/static/gsAdmin/components/migrateLegacySeerAction.tsx
@@ -7,6 +7,7 @@ import {
   addSuccessMessage,
 } from 'sentry/actionCreators/indicator';
 import type {Client} from 'sentry/api';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {withApi} from 'sentry/utils/withApi';
 
 import type {
@@ -54,9 +55,13 @@ class MigrateLegacySeerAction extends Component<Props, State> {
         addSuccessMessage('Legacy Seer migration complete.');
       })
       .catch(res => {
-        addErrorMessage(
-          res.responseJSON?.detail ?? res.responseText ?? 'Migration failed.'
-        );
+        if (res instanceof RequestError && typeof res.responseJSON?.detail === 'string') {
+          addErrorMessage(res.responseJSON.detail);
+        } else if (res instanceof RequestError && res.responseText) {
+          addErrorMessage(res.responseText);
+        } else {
+          addErrorMessage('Migration failed.');
+        }
       });
   };
 
diff --git a/static/gsAdmin/components/sendWeeklyEmailAction.tsx b/static/gsAdmin/components/sendWeeklyEmailAction.tsx
index 4148bd52346999..c9dcd94c42b5d1 100644
--- a/static/gsAdmin/components/sendWeeklyEmailAction.tsx
+++ b/static/gsAdmin/components/sendWeeklyEmailAction.tsx
@@ -8,6 +8,7 @@ import {
 import type {Client} from 'sentry/api';
 import {BooleanField} from 'sentry/components/forms/fields/booleanField';
 import {TextField} from 'sentry/components/forms/fields/textField';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {withApi} from 'sentry/utils/withApi';
 
 import type {
@@ -50,10 +51,12 @@ class SendWeeklyEmailAction extends Component<Props, State> {
         addSuccessMessage('Email queued');
       })
       .catch(res => {
-        if (res.status === 404) {
-          addErrorMessage('User is not a member of the organization!');
-        } else {
-          addErrorMessage(res.responseText || res.name);
+        if (res instanceof RequestError) {
+          if (res.status === 404) {
+            addErrorMessage('User is not a member of the organization!');
+          } else {
+            addErrorMessage(res.responseText || res.name);
+          }
         }
       });
   };
diff --git a/static/gsAdmin/views/relocationCreate.tsx b/static/gsAdmin/views/relocationCreate.tsx
index 0f3632d15b57ff..59e7b12f81b132 100644
--- a/static/gsAdmin/views/relocationCreate.tsx
+++ b/static/gsAdmin/views/relocationCreate.tsx
@@ -9,6 +9,7 @@ import {OverlayTrigger} from '@sentry/scraps/overlayTrigger';
 import {addErrorMessage, addSuccessMessage} from 'sentry/actionCreators/indicator';
 import {Client} from 'sentry/api';
 import {ConfigStore} from 'sentry/stores/configStore';
+import {RequestError} from 'sentry/utils/requestError/requestError';
 import {useApi} from 'sentry/utils/useApi';
 import {useNavigate} from 'sentry/utils/useNavigate';
 
@@ -50,7 +51,7 @@ function RelocationForm() {
             host: region.url,
           })
           .catch(error => {
-            if (error.status === 403) {
+            if (error instanceof RequestError && error.status === 403) {
               addErrorMessage(PROMO_CODE_ERROR_MSG);
 
               // Ensure that the wrapping `catch` block doesn't try to re-print this error message.