Hi Quinn, Thanks for such a quick response. I've done everything you suggested and at point 7 the error I stated in original post appears again.

Hello, any update would be appreciated on this issue. Thank you.

Sure, the apns-id is b0de9c87-58c1-48e1-aae1-521763afdec9

Same issue for me - when I accept an invitation, log in - enter 2 FA - and then it just shows the same log in screen again and again. Also got a bunch of welcome emails from Apple.