Hi, I am in need of help having exhausted the google search and found nothing. I have purchased a refurb 2015 iMac and have set myself as the admin account and am now setting it up for my assistant but I am unable to add her Apple ID to her (standard) user account. Having successfully signed in it all looks like it is happening as normal (even entering the 6 digits for 2FA) then the very last screen turns to this:
At this point, I can’t tell if it’s an authentication issue or something wrong with the macOS installation. If the former, that’s a call to Apple tech support to talk to the Apple ID people.
If the latter, there are lots of drastic things to try, starting with the easy thing of reinstalling macOS. I doubt that will do it, however. I’d bet you have to remove the faulty account at least.
So - we got to the bottom of it. It was all to do with either the Apple ID being created on an Android phone and/or then logging in on an iMac that had previously had 3 new Apple ID 's created on it.
I solved the problem by creating a new Apple ID on a newish iPad and then it worked like a dream.
Thank you for all your help and nudges in the right direction. We got there eventually