I shared a Canvas apps with an external user. They can access the app using a Desktop or mobile web browser, no issues.
When they open the PowerApps app on either Android or iOS, they do not see the application. When they click on a hyperlink to the app, the app opens and displays an error message 'This app isn't opening correctly'
I've tested this on iOS (14.6), iPadOS (14.5.1) and Android (10).
Session ID from screenshot:
Michael E. Gernaey
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