diff --git a/src/main/java/com/descope/sdk/mgmt/UserService.java b/src/main/java/com/descope/sdk/mgmt/UserService.java
index e096f281..022d5be0 100644
--- a/src/main/java/com/descope/sdk/mgmt/UserService.java
+++ b/src/main/java/com/descope/sdk/mgmt/UserService.java
@@ -240,6 +240,22 @@ UserResponseDetails updateEmail(String loginId, String email, Boolean isVerified
    * Update the email address for an existing user.
    *
    * @param loginId The loginID is required.
+   * @param email The email parameter can be empty in which case the email will be removed.
+   * @param isVerified The isVerified flag must be true for the user to be able to login with the
+   *     email address.
+   * @param failOnConflict The failOnConflict flag indicates whether to fail the update if the new
+   *     email is also the login ID of another user.
+   * @return {@link UserResponseDetails UserResponseDetails}
+   * @throws DescopeException If there occurs any exception, a subtype of this exception will be
+   *     thrown.
+   */
+  UserResponseDetails updateEmail(String loginId, String email, Boolean isVerified,
+      Boolean failOnConflict) throws DescopeException;
+
+  /**
+   * Update the phone number for an existing user.
+   *
+   * @param loginId The loginID is required.
    * @param phone The phone parameter can be empty in which case the phone will be removed.
    * @param isVerified The isVerified flag must be true for the user to be able to login with the
    *     email address.
@@ -250,6 +266,22 @@ UserResponseDetails updateEmail(String loginId, String email, Boolean isVerified
   UserResponseDetails updatePhone(String loginId, String phone, Boolean isVerified)
       throws DescopeException;
 
+  /**
+   * Update the phone number for an existing user.
+   *
+   * @param loginId The loginID is required.
+   * @param phone The phone parameter can be empty in which case the phone will be removed.
+   * @param isVerified The isVerified flag must be true for the user to be able to login with the
+   *     email address.
+   * @param failOnConflict The failOnConflict flag indicates whether to fail the update if the new
+   *     phone number is also the login ID of another user.
+   * @return {@link UserResponseDetails UserResponseDetails}
+   * @throws DescopeException If there occurs any exception, a subtype of this exception will be
+   *     thrown.
+   */
+  UserResponseDetails updatePhone(String loginId, String phone, Boolean isVerified,
+      Boolean failOnConflict) throws DescopeException;
+
   /**
    * Update an existing user's display name (i.e., their full name).
    *
diff --git a/src/main/java/com/descope/sdk/mgmt/impl/UserServiceImpl.java b/src/main/java/com/descope/sdk/mgmt/impl/UserServiceImpl.java
index 47cc8159..9499d78c 100644
--- a/src/main/java/com/descope/sdk/mgmt/impl/UserServiceImpl.java
+++ b/src/main/java/com/descope/sdk/mgmt/impl/UserServiceImpl.java
@@ -382,22 +382,36 @@ public UserResponseDetails deactivate(String loginId) throws DescopeException {
 
   @Override
   public UserResponseDetails updateEmail(String loginId, String email, Boolean isVerified) throws DescopeException {
+    return updateEmail(loginId, email, isVerified, false);
+  }
+
+  @Override
+  public UserResponseDetails updateEmail(String loginId, String email, Boolean isVerified,
+      Boolean failOnConflict) throws DescopeException {
     if (StringUtils.isBlank(loginId)) {
       throw ServerCommonException.invalidArgument("Login ID");
     }
     URI updateEmailUri = composeUpdateEmailUri();
-    Map<String, Object> request = mapOf("loginId", loginId, "email", email, "verified", isVerified);
+    Map<String, Object> request = mapOf("loginId", loginId, "email", email, "verified", isVerified,
+        "failOnConflict", failOnConflict);
     ApiProxy apiProxy = getApiProxy();
     return apiProxy.post(updateEmailUri, request, UserResponseDetails.class);
   }
 
   @Override
   public UserResponseDetails updatePhone(String loginId, String phone, Boolean isVerified) throws DescopeException {
+    return updatePhone(loginId, phone, isVerified, false);
+  }
+
+  @Override
+  public UserResponseDetails updatePhone(String loginId, String phone, Boolean isVerified,
+      Boolean failOnConflict) throws DescopeException {
     if (StringUtils.isBlank(loginId)) {
       throw ServerCommonException.invalidArgument("Login ID");
     }
     URI updatePhoneUri = composeUpdatePhoneUri();
-    Map<String, Object> request = mapOf("loginId", loginId, "phone", phone, "verified", isVerified);
+    Map<String, Object> request = mapOf("loginId", loginId, "phone", phone, "verified", isVerified,
+        "failOnConflict", failOnConflict);
     ApiProxy apiProxy = getApiProxy();
     return apiProxy.post(updatePhoneUri, request, UserResponseDetails.class);
   }
diff --git a/src/test/java/com/descope/sdk/mgmt/impl/UserServiceImplTest.java b/src/test/java/com/descope/sdk/mgmt/impl/UserServiceImplTest.java
index 6d6400d0..ecdf542b 100644
--- a/src/test/java/com/descope/sdk/mgmt/impl/UserServiceImplTest.java
+++ b/src/test/java/com/descope/sdk/mgmt/impl/UserServiceImplTest.java
@@ -367,6 +367,18 @@ void testUpdateEmailForSuccess() {
     }
   }
 
+  @Test
+  void testUpdateEmailWithFailOnConflictForSuccess() {
+    UserResponseDetails userResponseDetails = mock(UserResponseDetails.class);
+    ApiProxy apiProxy = mock(ApiProxy.class);
+    doReturn(userResponseDetails).when(apiProxy).post(any(), any(), any());
+    try (MockedStatic<ApiProxyBuilder> mockedApiProxyBuilder = mockStatic(ApiProxyBuilder.class)) {
+      mockedApiProxyBuilder.when(() -> ApiProxyBuilder.buildProxy(any(), any())).thenReturn(apiProxy);
+      UserResponseDetails response = userService.updateEmail("someLoginId", "someEmail", false, true);
+      Assertions.assertThat(response).isNotNull();
+    }
+  }
+
   @Test
   void testUpdatePhoneForEmptyLoginId() {
     ServerCommonException thrown = assertThrows(ServerCommonException.class,
@@ -387,6 +399,18 @@ void testUpdatePhoneForSuccess() {
     }
   }
 
+  @Test
+  void testUpdatePhoneWithFailOnConflictForSuccess() {
+    UserResponseDetails userResponseDetails = mock(UserResponseDetails.class);
+    ApiProxy apiProxy = mock(ApiProxy.class);
+    doReturn(userResponseDetails).when(apiProxy).post(any(), any(), any());
+    try (MockedStatic<ApiProxyBuilder> mockedApiProxyBuilder = mockStatic(ApiProxyBuilder.class)) {
+      mockedApiProxyBuilder.when(() -> ApiProxyBuilder.buildProxy(any(), any())).thenReturn(apiProxy);
+      UserResponseDetails response = userService.updatePhone("someLoginId", "1234567890", false, true);
+      Assertions.assertThat(response).isNotNull();
+    }
+  }
+
   @Test
   void testUpdateDisplayNameForEmptyLoginId() {
     ServerCommonException thrown = assertThrows(ServerCommonException.class,
@@ -886,8 +910,8 @@ void testFunctionalFullCycle() {
     userService.updateDisplayName(loginId, "Testing Test");
     userService.updateDisplayNames(loginId, "G Test", "M Test", "F Test");
     email = TestUtils.getRandomName("test-") + "@descope.com";
-    userService.updateEmail(loginId, email, true);
-    userService.updatePhone(loginId, "+1-555-555-6666", true);
+    userService.updateEmail(loginId, email, true, false);
+    userService.updatePhone(loginId, "+1-555-555-6666", true, false);
     String newLoginId = TestUtils.getRandomName("u-");
     userService.updateLoginId(loginId, newLoginId);
     UserResponseDetails loadResponse = userService.load(newLoginId);