can not sign into my iCloud account on my Mac
Suddenly, I can not sign into my iCloud account on my 2018 MacBook Air. I get the message "This Apple ID has been locked for security reason." The message shows an old Apple ID, not my current Apple ID.
I've signed out and back in. Restarted computer.
I've reset my iCloud password.
I'm still locked out.
iCloud services on my iPhone and iPad are fine.
MacBook Air