I uploaded my MSIX package to the Microsoft Store with a test code signing certificate matching the product identity CN, but after downloading it from the Store, it doesn't appear in the Kiosk mode app list

Question

I have uploaded an MSIX package of my app to the Microsoft Store. The app is designed to run in Kiosk mode. The MSIX package was signed using a test code signing certificate, with the CN value matching the "Publisher" value specified in the product identity of the Microsoft Store listing.

After downloading and installing the app from the Microsoft Store onto a Windows laptop, when attempting to configure the device for Kiosk mode, our app is not appearing in the list of available apps to assign for Kiosk mode.