Same problem for us too, we created an app on TestFlight and invited users already registered as internal testers about 3 hours ago but the emails haven't arrived yet

Thank you very much for your reply, but I would ask you, however, what is meant by "ordinary app"? Am I to guess that "non-arbitrary" apps can have certain APIs unblocked? How can I make my app "non ordinary"? I'm asking these questions because I've noticed other apps that somehow and ALWAYS seem to work fine even when the app is killed. Thanks for the replies