How would I publish a .NET 6.0 application to the Store for all platforms?

Question

Try this:

1. Create .Net 6.0 WPF application.
2. Add a packaging project to the solution and add the WPF application as a target.
3. Associate with an app in the Windows Store and publish.

This used to work until Visual Studio 17.3 but it doesn't anymore. Please tell me the steps to achieve the title.