Builds suddenly not showing in TestFlight

Similarly, my build hasn't shown up on TestFlight for nearly two days.

Maybe related: I've created a new App and wanted to distribute it via TestFlight to internal testers, but added me first to check out everything. But when opening the invitation email, the TestFlight App tells me that the email address with which I'm currently logged-in in TestFlight (and it names the email address in clear text) is not the one which is associated with the invitation. It also tells me that I should login with my original account and showing me its address (slightly anonymized), which is exactly the same as the one it has found not the right one before.

So I assume that right now there's something broken with TestFlight when it checks if it is allowed to install the App.

In my case it fails to detect if identical email addresses are indeed identical. Maybe in your cases, the problem is something similar, but because you already have the App in Testflight and don't need an invitation anymore, you don't get an error message.

Maybe the problem is also related to the iOS 26 Beta, because I used Xcode 26 and the App was built for iOS 26. But the error message does not indicate anything like that.