Hi Apple,
TestFlight has been really patchy for the last few weeks. I keep getting a message that says "TestFlight is currently unavailable. Try again later."
Whilst it has worked occasionally, this has been a recurring problem between at least 20-Apr-2018 and today (1-May-2018).
Your system status (https://developer.apple.com/system-status/) says that TestFlight is OK but that is not true.
I hope you can fix this because it is really hard to test without TestFlight!
Thanks
Alex