@SysAdmin Yes, it totally is related and I'm in the same situation here, the only app URL I can find is https://apps.microsoft.com/store/detail/adobe-acrobat-reader-dc/XPDP273C0XHQH2
Which Azure Endpoint Management (Intune) doesn't recognise as a valid Appstore URL to add the app.
Did you manage to get anywhere with this?