diff --git a/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.NativeAOT.targets b/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.NativeAOT.targets
index 6ef82b37f11..fb655661a24 100644
--- a/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.NativeAOT.targets
+++ b/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.TypeMap.Trimmable.NativeAOT.targets
@@ -41,6 +41,31 @@
     </ItemGroup>
   </Target>
 
+  <!--
+    Force the typemap to be generated in the OUTER build (the build that is not an inner
+    per-RID build, i.e. '$(_OuterIntermediateOutputPath)' == '') before _ResolveAssemblies
+    spawns the inner per-RID ILC build. The inner build consumes the typemap assembly list
+    (via _AddTrimmableTypeMapAssembliesToIlc -> _ReadGeneratedTrimmableTypeMapAssemblies)
+    but cannot generate it: _GenerateTrimmableTypeMap is gated to the outer build (it requires
+    '$(_OuterIntermediateOutputPath)' == ''). _GenerateTrimmableTypeMap's own AfterTargets="CoreCompile"
+    trigger does not fire when compilation is up-to-date - e.g. the IDE's separate "Compile" then
+    "SignAndroidPackage" invocations (BuildingInsideVisualStudio=true) - leaving the file ungenerated
+    and the inner build failing with "Trimmable typemap assembly list ... was not found".
+    This mirrors the CoreCLR _AddTrimmableTypeMapToLinker target, which forces generation before the
+    (outer) ILLink. _ResolveAssemblies runs after compilation (it consumes @(IntermediateAssembly)), so
+    the generator still observes the compiled app assembly.
+
+    The condition matches on '$(_OuterIntermediateOutputPath)' == '' (the same discriminator
+    _GenerateTrimmableTypeMap uses) rather than 'RuntimeIdentifier == ''' so that single-RID outer
+    builds (e.g. -p:RuntimeIdentifier=android-arm64) are covered too; the inner build sets
+    _OuterIntermediateOutputPath via _ResolveAssemblies AdditionalProperties, so this target is
+    correctly skipped there.
+  -->
+  <Target Name="_EnsureTrimmableTypeMapGeneratedForNativeAotInnerBuild"
+      Condition=" '$(_OuterIntermediateOutputPath)' == '' "
+      BeforeTargets="_ResolveAssemblies"
+      DependsOnTargets="_GenerateTrimmableTypeMap" />
+
   <Target Name="_CollectTrimmableNativeAotDgmlFiles"
       Condition=" '$(PublishTrimmed)' == 'true' and '$(_ProguardProjectConfiguration)' != '' ">
     <ItemGroup>