TestFlight: Complete test information is required to submit a build for external testing

My app is in internal testing on iTunes Connect, but I cannot promote it to external testing. It tells me that the test information is incomplete.

I have tried all sorts of things, including reading this doc and this doc on Apple and re-entering all the information again. Playing with the language specifier.

This is maddening, because this exact information worked for a previous build.

I checked and unchecked "Sign-in required" and Saved and the warning icon finally went away.

Apple has new requirements for test information. It now requires a phone number, but it didn't a couple of weeks ago.

For the benefit of others, here is the information that was needed to be complete for our app on 2 May 2017.

Test Information

• Beta App Description

(We had this only in English (U.S.) Although our app has French versions, we were able to get away without a description in those languages.)

• Feedback Email
• Marketing URL
• Privacy Policy URL

Beta App Review Information

• Contact Information (all fields)
• Demo Account

(Our app requires a login. Your mileage may vary.)

We did not have Review Notes or a License Agreement.

In my case all information was filled but still showing error "Complete test information is required to submit for review/external tester". I checkd, unchecked the sign in required option and saved it. It saved succeessfully :)

I had to check sign-in required and enter some dummy information. after I saved I went back and unchecked it, saved again; all good.