After 2022-11 Cumulative Update for Windows 11 Version 22H2 all Microsoft Project Add-Ins missing

[JohnDoeCal]

Hi,

after this week's Windows 11 updates none of our Microsoft Project VSTO Add-Ins are working any more in Microsoft Project Online Desktop Client MSO (Version 2211 Build 16.0.15831.20078) 64-bit. They are still registered, but do not load anymore.

Does anybody know the root cause and any work around?

Thanks,

John

[#2]

I have the same problem. Can anybody help?

The error it shows is: 

This is the full error message: 

Customization could not be loaded because the application domain could not be created.

************** Exception Text **************
Microsoft.VisualStudio.Tools.Applications.Runtime.CannotCreateCustomizationDomainException: Customization could not be loaded because the application domain could not be created. ---> System.InvalidOperationException: version
at Microsoft.VisualStudio.Tools.Office.Runtime.DomainCreator.GetHostVersion(IHostServiceProvider sp, UInt32& officeVersionUInt)
at Microsoft.VisualStudio.Tools.Office.Runtime.DomainCreator.CreateCustomizationDomainInternal(String solutionLocation, String manifestName, String documentName, Boolean showUIDuringDeployment, IntPtr hostServiceProvider, Boolean useFastPath, IntPtr& executor)
--- End of inner exception stack trace ---

************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.8.9105.0 built by: NET481REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
Microsoft.VisualStudio.Tools.Office.Runtime
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Office.Runtime/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Office.Runtime.dll
----------------------------------------
Microsoft.VisualStudio.Tools.Applications.Hosting
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.Hosting/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.Hosting.dll
----------------------------------------
Microsoft.VisualStudio.Tools.Applications.ServerDocument
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.ServerDocument/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.ServerDocument.dll
----------------------------------------
Microsoft.Office.Tools
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.dll
----------------------------------------
Microsoft.VisualStudio.Tools.Applications.Runtime
Assembly Version: 10.0.0.0
Win32 Version: 10.0.60828.0
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.Runtime/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.Runtime.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.8.9065.0 built by: NET481REL1LAST_C
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------

You can see the error messages by unsuppressing error messages from adding a variable into Environment Variables -> System Variables

Variable Name: VSTO_SUPPRESSDISPLAYALERTS

Variable Value: 0