You need meet some pre-requirements to submit the WPF app to Microsoft Store.
Part 1: You should be a developer for Microsoft Store.If you are not, this article describes how to register for a Windows developer account in Partner Center.
Part 2: Package your WPF project as a desktop bridge app before the submission.I will show you how to do it by using Visual studio(There is no need to sign the package if package the app with Visual Studio).
In Visual Studio, open the solution that contains your desktop application project.
Add a Windows Application Packaging Project to your solution.
我来说两句