Could not install [App] The requested app is not available or doesn't exist. In TestFlight

I uploaded a build to testflight and released it to Internal testers, however when the testers tried downloading the app a alert dialog shows the following:

Could not install [App] The requested app is not available or doesn't exist.

Also tried to submit it via external testers but getting another error.

Additional info:

This is the first time uploading this app so it's not rejected or removed from saleNo pending agreement that needs to be accepted
Could not install [App] The requested app is not available or doesn't exist. In TestFlight
 
 
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