No TestFlight invite email gets sent for internal users

Question

I set up my application for TestFlight. For external users it is waiting for review. But if I want to invite internal users, I select them and press invite. iTunes Connects says

Answer 1

I needed to resend the invitation email to an internal tester. The following work for me:

deselect the invited tester and save. this remove the invite. re-select the same tester and save. this added the tester and re-send the email.

Also, you have to click on the link in the email to see the update. Otherwise, the TestFlight app still shows no app available until you click on the link. I found the email was in the spam folder in the first place ...