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

This is an outstanding bug. A report has been filed, see details below. To get Apple to address this issue sooner, please submit a similar report through https://bugreport.apple.com