Yep, it was a service interruption (unrelated to this feature being released, just bad timing!) Let me know if you still can’t get it working @ChrisMildebrandt
Yes, @kalob.devries this is correct.
I don’t think that the +email addresses will work either because after you’ve invited the user via email they have to log in via a Google or Microsoft account and I believe that is specific to the original email rather than the +email.