Testflight install button does not work

Hi, I have a new Flutter app which works fine on simulator and on device when installing using a cable. I'm able to build and successfully submit it for testing on Testflight, however when a tester clicks "INSTALL" on TestFlight it spins fairly quickly and just resets back to the "INSTALL" button without actually installing anything. There's no error message or warning, it just resets.

I'm also experimenting this. There's no error message but the app icon is present. If I try to open it I'm having an error message: https://developer.apple.com/forums/thread/721474?page=1#739052022

Also related to https://developer.apple.com/forums/thread/720033?page=2

Yeah I also get the app icon that gives me an integrity error when I click it.

+1

Testflight install button does not work
 
 
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