In order to publish your PWA in the Microsoft Store, you'll need 3 things:
Package ID
Publisher ID
Publisher display name
To get this information, go to Windows Partner Center and click on your app. (Don't have an app yet? Create one.)
Choose Product Management
-> Product Identity
:
You'll see the Package ID, Publisher ID, and publisher display name. You'll need all three of these to publish in the Store.
On PWABuilder when generating your Windows app, add these values to the Windows package options:
Having trouble getting your package info? You can open an issue and we'll help walk you through it.