Not able to begin "External Testing"—iTunes Connect resets to "Not available for testing"

Question

I have my external testers setup, my build uploaded and "Ready to test," and when I click "Start testing" on the iTunes Connect "External Testing" page, everything appears to be fine.

However, when I reload the page, my build has been unselected and "Not Available For Testing" has been reselected instead. Also, my testers aren't receiving the email! Any quick advice on this would be terrific, thanks for reading.

(Also, my app is big, over 200 MB. But, I've run betas before with no problem before the iTunes Connect redesign.)

Answer 1

It's ok now. It seems FlightTest service is not work until yesterday, but it's working fine now, you can try again! BTW, mail naming of the letters have to all lower case, not including any upper case and fill to what to test/app description textfield by your pre-release app.

Answer 2

The issue appears to be resolved. No changes at all on my end, but this time after pressing "Start testing" it actually works. My beta invitations were sent out successfully. (I later heard back from Apple who confirmed it was a problem on their end. Quite good custom support.)