Super frustrating. With Apple Login as a requirement these days, it's actually important to be able to test emailing the user, and using plus addresses was a huge timesaver.

Same here for Xcode 11.7, although I have the strange result that builds I upload from Xcode work, but builds I upload via fastlane fail with this error. I've compared the settings and everything looks correct. Used to work fine, then suddenly started failing with ITMS-90562.