There was an error connecting to the Apple ID server
Since updating my Macbook Pro 13" (2018, with touchbar) to Big Sur, I have been unable to sign in to any service which requires my Apple ID.
I cannot access the Appstore to update or download Apps. I cannot use Mail, I can't even use Maps on my Macbook.
Despite this, I have full access to my Apple ID account, as evidenced by posting here (using a browser on my Macbook). On my other Apple device (iPad Air 2), I have full access to all services. This is not an issue with my Apple ID.
I have changed the password after the first few failed attempts, but neither the old or new password generated any response.
I do not understand what is causing this issue. I also do not know if it is safe to attempt to reset the laptop. I tried to sign out of my Apple ID in system preferences, but this requires me to enter my password to turn off Find My Mac. This request fails each time, with the same error message "There was an error connecting to the Apple ID server"
MacBook Pro 13″, macOS 11.0