Today, I was deploying my beta app to multiple external testers. Some testers received an invite successfully, but others encountered issues. To resolve this, I created another external testing session and opened it to a public URL. I added three testers, but after adding the fourth one, the URL started failing. When I checked TestFlight, I noticed that all of my builds had expired. I assumed it was a glitch, so I signed out and back in, but nothing changed. I added another build, and although it says it's ready to test, it throws an internal error and asks me to try again.
I also called Apple Support, and they informed me that this is a recurring issue. They are currently working on pinpointing the common denominator. Has anyone else experienced this? Any solutions or ETA? My client is waiting for the app to be available.