I can't see my app on TestFlight

I'm an admin for my team on App Store Connect, and we have several users testing our app on TestFlight. I'm added as an Internal Tester for the app, but when I open TestFlight I don't see the app (I see other apps I'm a tester for, but not this one). I went to the Internal Testers list on App Store Connect and removed and re-added myself, and immediately got an email saying "build X is read to test on iOS. To test this app, open TestFlight", which I clicked, it took me to TestFlight, and said "this build is no longer available. This build is the one I just pushed out and is available to all other testers. Does anyone know how I can approach this?