I have the same problem, evem when i build and submit the app with Expo App Services, my app's new build appears in Testflight, but I can't install it: The app is not available or doesnt exist (I translated it from french). However, some of my friends who have an old build on their iPhone can still open it on TestFlight, despite I deleted the old app and builds... I don't understand what is going on tbh.