Issues

• CreateChannelAsync fails with 0x8007139f (ERROR_INVALID_STATE) — Pending PFN to Entra AppId Mapping for Sideloaded MSIX

  needs-triage
  microsoft/WindowsAppSDK#6842 · Filter by author nixonchew-section opened on Oct 6, 2026

• [App Notifications] Unpackaged official sample: Register/Show succeed and Setting is Enabled, but notification never appears in Shell

  area-Notificationsneeds-area-owner-attention
  microsoft/WindowsAppSDK#6821 · Filter by author moz65535 opened on Sep 29, 2026
  1

• Explicit ResourceContext Language is ignored when PrimaryLanguageOverride is set

  area-MRTCoreneeds-area-owner-attention
  microsoft/WindowsAppSDK#6801 · Filter by author MrtSafin opened on Sep 25, 2026

• MoAppHang during updates of windowless widget hosts

  area-Widgetsarea-WinUIneeds-area-owner-attention
  microsoft/WindowsAppSDK#6797 · Filter by author tipa opened on Sep 24, 2026

• Store upload fails with "Failed to merge PRI file ... 80073B2F" for x86+x64 bundle: Microsoft.Windows.Workloads resources only present in x64 package

  area-WCRneeds-area-owner-attention
  microsoft/WindowsAppSDK#6790 · Filter by author JosHuybrighs opened on Sep 23, 2026

• Native C++ StaticLibrary is misclassified by Windows App SDK self-contained targets, leaking runtimes-framework into consuming packaged apps

  area-SelfContainedneeds-area-owner-attention
  microsoft/WindowsAppSDK#6780 · Filter by author hoshiizumiya opened on Sep 21, 2026

• windows.diagnosticServiceModule still causes ACCESS_DENIED for WerFault.exe

  area-PackageManagementbug
  Bug

  microsoft/WindowsAppSDK#6777 · Filter by author BernhardMarconato opened on Sep 19, 2026
  3

• AppNotificationManager.Register() still throws 0x8007007E (missing Microsoft.WindowsAppRuntime.Insights.Resource.dll) in self-contained unpackaged apps on 2.5.1; #6071 closed by #6725 but not fixed

  area-Notificationsarea-SelfContainedStatus: Pending release
  microsoft/WindowsAppSDK#6774 · Filter by author GenerAhl opened on Sep 18, 2026
  

• Proposal: Add IReserveableVector to WinRT

  feature proposalneeds-triage
  microsoft/WindowsAppSDK#6768 · Filter by author YexuanXiao opened on Sep 17, 2026

• NU1603 reported when installing WinUI 2.3.9 (2.5.1) Subpackage only

  area-Metapackageneeds-area-owner-attention
  microsoft/WindowsAppSDK#6766 · Filter by author Sella-GH opened on Sep 17, 2026
  2

• Certificate conflict when installing multi-architecture MSIX bundle

  area-MSIXBuildToolsStatus: In PR
  microsoft/WindowsAppSDK#6765 · Filter by author petercoin opened on Sep 17, 2026
  

• [Bootstrap/Deployment] Unpackaged WinAppSDK 2.x apps resolve the latest compatible runtime and cannot select the build-time minor version

  area-DynamicDependenciesResolution-By-Design
  microsoft/WindowsAppSDK#6755 · Filter by author hoshiizumiya opened on Sep 13, 2026
  6

  

• Crash on building a notification

  area-Notificationsneeds-area-owner-attention
  microsoft/WindowsAppSDK#6746 · Filter by author dmitmaloukas opened on Sep 11, 2026

• [Bug] SystemMediaTransportControls.GetForCurrentView throws “Invalid window handle” in WinUI 3

  area-Externalneeds-area-owner-attention
  microsoft/WindowsAppSDK#6740 · Filter by author Lorymi opened on Sep 5, 2026
  2

• Outdated roadmap documentation

  documentationneeds-area-owner-attention
  microsoft/WindowsAppSDK#6736 · Filter by author daverayment opened on Sep 2, 2026

• Fail-fast 0xC000027B on machines with accumulated WindowsAppRuntime 1.8 revisions: activation fails with "Package not found" for the framework package the process is running from

  area-Activationneeds-area-owner-attention
  microsoft/WindowsAppSDK#6724 · Filter by author cregecambrin opened on Aug 27, 2026
  5

• dotnet publish omits the app's .pri for unpackaged WinUI apps: publish wiring exists only on the MSIX path, not the MrtCore path

  area-MRTCorearea-Packagingneeds-area-owner-attention
  microsoft/WindowsAppSDK#6720 · Filter by author azchohfi opened on Aug 26, 2026
  2

• [MSIX] Add SYSTEM support for apps and drivers.

  area-External
  microsoft/WindowsAppSDK#6717 · Filter by author mominshaikhdev opened on Aug 25, 2026
  1

• Add a C++/WinRT 3.x module-ready option/project template for WinUI C++ projects

  area-WinAppSDK:Templatesneeds-area-owner-attention
  microsoft/WindowsAppSDK#6690 · Filter by author hoshiizumiya opened on Aug 14, 2026
  1

• Add a plain C++/WinRT Runtime Class item template for WinUI projects

  area-WinAppSDK:Templatesneeds-area-owner-attention
  microsoft/WindowsAppSDK#6689 · Filter by author hoshiizumiya opened on Aug 14, 2026
  4

• C++/WinRT WinUI item templates generate incorrect namespaces and generated-file paths for items in project subfolders

  area-WinAppSDK:Templatesneeds-area-owner-attention
  microsoft/WindowsAppSDK#6688 · Filter by author hoshiizumiya opened on Aug 14, 2026

• Improve the transparency of triage, ownership, and public decision-making process in the WASDK and WinUI repos

  documentation
  microsoft/WindowsAppSDK#6672 · Filter by author 0x5bfa opened on Aug 6, 2026
  1

  

• Self-contained component targets expose runtime payloads as project items during DesignTimeBuild

  area-SelfContainedneeds-area-owner-attention
  microsoft/WindowsAppSDK#6666 · Filter by author Illustar0 opened on Aug 2, 2026
  2

• Standard users cannot launch WinAppSDK apps: Singleton package Access Denied (0x80070005)

  area-PackageManagementneeds-area-owner-attention
  microsoft/WindowsAppSDK#6642 · Filter by author SharpDevSa opened on Jul 21, 2026
  2

• BatchRecognition returns English text for Japanese audio with no documented language setting

  area-WCRneeds-area-owner-attention
  microsoft/WindowsAppSDK#6640 · Filter by author hrtk91 opened on Jul 20, 2026