External Users Accessing Power App

The whole company is newish to power apps and dyn 365 and I'm confused. We have a working power app which connects to tables in custom environment. We have a per app plan with 25 users being able to access the app at the same time. This works great for internal users.

However we have a number of external users who say they cannot access the app. Now note all these users even though external exist on the 365 platform and have the same email accounts/domains as the internal, but like joebloggs.ext@mycompany.com.

All these accounts are added into the relevant security group and have access as basic users to the app itself.

Are we missing something fundamental here? The odd thing is some uses who are contractors also have the same email format as externals but can access the app.

I suspect that the difference between the contractors and the other external users is that the contractors have some kind of Power apps license in their home tenant. Guest users must have a license to access a Power App, even one with standard connectors. The contractors probably have such a license, even if it doesn't cover premium. So they access the shared app, find out its premium and are assigned a per app license. But the other Guest users can't access the shared app at all and since the per app license is assigned when the app is run the first time, and its determined that the user needs premium licensing, they never get a chance to be assigned a per app license. Try assigning them one of the Power Apps and Logic Flows licenses in your tenant. Those are free and although it won't cover their use of the app it should let them access the app to get a per app license.

One other correction. Per app licenses aren't for concurrent usage. Once a license is used it stays with that user. So once 25 users have accessed the app and consumed the 25 licenses you'll need to purchase additional licenses other users even if the original 25 are no longer using the app.

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