Rich activation - windows.printSupportSettingsUI doesn't work

Describe the bug

If you try to deploy a blank packaged app with extension
uap12:Extension Category="windows.printSupportSettingsUI"
It fails with error "The request is not supported." when you try to deploy.

But documentation indicates "Packaged apps that use the Windows App SDK support all 44 of UWP's activation kinds"

Steps to reproduce the bug

1. Visual Studio 2019, Windows App SDK C# VS2019 Templates, 22494 pre-release SDK

2. Create a new VS2019 Project - Blank App, Packaged with Windows Application Packaging Project (VVinUI 3 in Desktop)

3. To the package.appxmanifest file add
   uap10:SupportsMultipleInstances="true"
   uap12:Extension Category="windows.printSupportSettingsUI"
   where:
   xmlns:uap12="http://schemas.microsoft.com/appx/manifest/uap/windows10/12"
   xmlns:uap10="http://schemas.microsoft.com/appx/manifest/uap/windows10/10"

4. Build and deploy and you get this error:
   DEP0700: Registration of the app failed. [0x80073CF6] AppxManifest.xml(33,10): error 0x80070032: Cannot register the ca25f28d-d8d9-4d0f-8831-66556e4c475d_1.0.0.0_x64__jnbzrh1prja8t package because the following error was encountered while registering the windows.printSupportJobUI extension: The request is not supported. Try again and contact the package publisher if the problem persists.

Expected behavior

Should be able to register for that activation.

Screenshots

No response

NuGet package version

1.0.0

Packaging type

Packaged (MSIX)

Windows version

Insider Build (xxxxx)

IDE

Visual Studio 2019

Additional context

No response

Start by reproducing the deployment failure from the packaged Blank App steps and inspect package.appxmanifest, especially the uap12 windows.printSupportSettingsUI extension and uap10 SupportsMultipleInstances setting. Investigate the DEP0700 registration error and confirm that a package declaring this activation kind can build, deploy, and register successfully.