Installing testflight internal test package, failed to start
Testflight external test, build version failed
Installing testflight internal test package, failed to start
Testflight external test, build version failed
You should rebuild the app through latest version of Xcode and then upload it to App Store Connect again.
You can get latest Xcode at Mac App Store or https://developer.apple.com/download/applications
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WindowsMEMZ @ Darock Studio