I can not recall excactly when start happening but it could be with an update of the OS. The point is that the accounts that i already had, i.e iCloud, email that we’re working perfectly stop working, so i delete all of them and now when tying to add them again it does not allow me to create them.
For the iCloud one i am asked for a 6 digits confirmation code, sent to my iPad and when i type the code it is said that it is wrong.
For the gmail one, i am told that it is an authorization error “error 400: invalid request” and that apple mail does not fulfill OAuth 2.0 requirements.
as summary i am simply trying to recover my old emails accounts in my Mac, but it seems that something changed and they are not working.
BR