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:
Has anyone seen this before and can point me in the right direction?
Many thanks for any help