Forgotten Password - restarting may cause other users logged into this computer to lose unsaved changes
I have a mid 2015 MacBook Pro running Big Sur that I want to use. The password has been forgotten, so I have followed the instructions to reset it using my Apple ID. It accepts the Apple ID and password and warns me that a new key chain will be created. After I accept that it pops up a screen that says "restarting may cause other users logged into this computer to lose unsaved changes" The only user logged onto the computer is the one with the forgotten password, and I can't move forward until I log on with a forgotten password.
Earlier Mac models