When trying to launch the app through testflight, i'm getting an error popup saying:
"MyAppName" Beta Has Expired
However, it literally says "Expires in 90 days" in testflight (i made this build yesterday). Only uninstalling the app and reinstalling through testflight fixes the issue. Restarting the phone does not work. This has happened multiple times with different builds and is starting to become an issue.
I suspect it might be related to us having many older builds that are expiring due to age, however I've double checked that only the latest non-expired build is the one installed on the device.
I also found this other (unsolved) forum post from 3 years ago which seems to describe the same problem. https://developer.apple.com/forums/thread/117035