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

• Click on the Internal Testers tab
• Deselect the testers not receiving invites and Save
• Return to the Builds tab
• Click the Invite Testers link that appears
• Reselect the previously deselected testers and Save

Ran into the issue and this worked without a lot of extra / wasted effort