I’m trying to upload my IPA to Apple in order to send it out via TestFlight. But, for some reason I can’t sign in to the application loader with my Apple ID. What am I missing here? My credentials are OK because I can login to itunesconnect and see my Dev account and other apps connected to the account. I don’t have 2FA turned on.
Exactly the same thing happened to me yesterday, and I borrowed the mac and have since had to hand it back so unfortunately no solution. Have you tried an older version of XCode?