diff --git a/eng/gradle/mirror-dependencies.ps1 b/eng/gradle/mirror-dependencies.ps1
index a1c43f1b547..c28bb0e20a0 100644
--- a/eng/gradle/mirror-dependencies.ps1
+++ b/eng/gradle/mirror-dependencies.ps1
@@ -35,7 +35,8 @@
     Maven coordinates to mirror directly, for tests that do not use Gradle.
     Each value is group:artifact:version, which attempts the POM, JAR, AAR, and
     Gradle module metadata files. Append an exact filename as a fourth segment
-    when a test requests a nonstandard payload.
+    when a test requests a nonstandard payload. The command fails if no payload
+    can be mirrored for any requested coordinate.
 
 .PARAMETER GradleWrapper
     Optional path to the Gradle wrapper used by CI for this project, relative
@@ -126,7 +127,12 @@ function Invoke-Mirror($logPath) {
         ForEach-Object { $_.Matches } |
         ForEach-Object { $_.Groups[1].Value } |
         Sort-Object -Unique
-    if ($urls.Count -eq 0) { return 0 }
+    if ($urls.Count -eq 0) {
+        return [pscustomobject]@{
+            SuccessCount = 0
+            FailureCount = 0
+        }
+    }
     $token = Get-AzDevOpsToken
     $basicCredential = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(":$token"))
     $headers = @{ Authorization = "Basic $basicCredential" }
@@ -141,7 +147,10 @@ function Invoke-Mirror($logPath) {
         }
     }
     Write-Host "  -> mirrored OK=$ok, not-found=$fail (of $($urls.Count))" -ForegroundColor Cyan
-    return $urls.Count
+    return [pscustomobject]@{
+        SuccessCount = $ok
+        FailureCount = $fail
+    }
 }
 
 function Get-MavenArtifactUrls($artifacts) {
@@ -177,15 +186,26 @@ if ($PSCmdlet.ParameterSetName -eq 'MavenArtifact') {
     Write-Host "Mirroring Maven artifacts directly:"
     $MavenArtifact | ForEach-Object { Write-Host "  $_" }
     $log = Join-Path ([IO.Path]::GetTempPath()) 'maven-artifact-mirror.log'
+    $failedArtifacts = @()
     try {
-        Get-MavenArtifactUrls $MavenArtifact |
-            ForEach-Object { "Could not GET '$_'" } |
-            Set-Content $log
-        Invoke-Mirror $log | Out-Null
+        foreach ($artifact in $MavenArtifact) {
+            Get-MavenArtifactUrls $artifact |
+                ForEach-Object { "Could not GET '$_'" } |
+                Set-Content $log
+            $result = Invoke-Mirror $log
+            if ($result.SuccessCount -eq 0) {
+                $failedArtifacts += $artifact
+            }
+        }
     }
     finally {
         Remove-Item $log -ErrorAction SilentlyContinue
     }
+    if ($failedArtifacts.Count -gt 0) {
+        Write-Host "`nNo payloads were mirrored for:" -ForegroundColor Red
+        $failedArtifacts | ForEach-Object { Write-Host "  $_" -ForegroundColor Red }
+        exit 1
+    }
     return
 }
 
@@ -208,8 +228,8 @@ try {
             Write-Host "`nBUILD SUCCESSFUL after $i iteration(s). The feed now has the packages CI needs." -ForegroundColor Green
             return
         }
-        $count = Invoke-Mirror $log
-        if ($count -eq 0) {
+        $result = Invoke-Mirror $log
+        if (($result.SuccessCount + $result.FailureCount) -eq 0) {
             Write-Host "`nGradle failed but no 401s to mirror — see $log" -ForegroundColor Red
             Get-Content $log -Tail 30
             exit 1
diff --git a/external/Java.Interop b/external/Java.Interop
index 33992194b93..8e8291c9ef4 160000
--- a/external/Java.Interop
+++ b/external/Java.Interop
@@ -1 +1 @@
-Subproject commit 33992194b9373e9322244612c94ed9941b9bc2fd
+Subproject commit 8e8291c9ef45b4bbc28b09456dc5888eb80af77b
diff --git a/src/Xamarin.Android.Build.Tasks/Tasks/JavaDependencyVerification.cs b/src/Xamarin.Android.Build.Tasks/Tasks/JavaDependencyVerification.cs
index 3e9740609e7..92380901e3d 100644
--- a/src/Xamarin.Android.Build.Tasks/Tasks/JavaDependencyVerification.cs
+++ b/src/Xamarin.Android.Build.Tasks/Tasks/JavaDependencyVerification.cs
@@ -272,7 +272,13 @@ public MSBuildLoggingPomResolver (TaskLoggingHelper logger)
 		try {
 			using (var file = File.OpenRead (filename)) {
 				var project = Project.Load (file);
-				var registered_artifact = Artifact.Parse (project.VersionedArtifactString);
+
+				// POMs may inherit GroupId/Version from a <parent> element, so fall back to
+				// the parent's values when the project itself doesn't declare them. (Without
+				// this, building an Artifact would fail validation with an empty coordinate.)
+				var groupId = project.GroupId.HasValue () ? project.GroupId : (project.Parent?.GroupId ?? "");
+				var version = project.Version.HasValue () ? project.Version : (project.Parent?.Version ?? "");
+				var registered_artifact = new Artifact (groupId, project.ArtifactId ?? "", version);
 
 				// Return the registered artifact, preferring any overrides specified in the task item
 				var final_artifact = new Artifact (
diff --git a/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/JavaDependencyVerificationTests.cs b/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/JavaDependencyVerificationTests.cs
index 4c59593ebf3..eb5774ed761 100644
--- a/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/JavaDependencyVerificationTests.cs
+++ b/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/JavaDependencyVerificationTests.cs
@@ -78,6 +78,27 @@ public void NoSpecifiedDependencies ()
 		Assert.AreEqual (0, engine.Errors.Count);
 	}
 
+	[Test]
+	public void InheritedArtifactCoordinates ()
+	{
+		using var parent_pom = new PomBuilder ("com.google.auto.value", "auto-value-parent", "1.10.4").BuildTemporary ();
+		using var pom = new PomBuilder ("", "auto-value-annotations", "")
+			.WithParent ("com.google.auto.value", "auto-value-parent", "1.10.4")
+			.BuildTemporary ();
+
+		var engine = new MockBuildEngine (TestContext.Out, []);
+		var task = new JavaDependencyVerification {
+			BuildEngine = engine,
+			AndroidLibraries = [CreateAndroidLibraryTaskItem ("auto-value-annotations.jar", pom.FilePath)],
+			AdditionalManifests = [CreateAndroidAdditionManifestTaskItem (parent_pom.FilePath)],
+		};
+
+		var result = task.RunTask ();
+
+		Assert.True (result);
+		Assert.AreEqual (0, engine.Errors.Count);
+	}
+
 	[Test]
 	public void MissingSpecifiedDependency ()
 	{