After TestFlight upgrade for 2000 testers, notification emails are not sended.
I am adding external TestFlight testers from a csv, they are added succesfully, I press SAVE button but the iOS column of TestFlight remains empty.
For the previous testers I added the iOS column displays "Notified" or "Installed 1.0 (<bulid number>)"
What should I do to make TestFlight working again?