can't login to Apple ID on my MacBook
Hello,
I can't login to my Apple ID on my MacBook Air (13-inch Early 2015 MacOS 10.13.6 High Sierra). After typing password, red caption appears that says something like 'Failed to perform action. Please try again.' And I can't sign in to App Store either.
I followed the steps specified at If you can't connect or sign in to iCloud - Apple Support
Problem remained. But I can login to my account on site appleid.apple.com. So, I have the right ID and password. That means I don't have to reset password.
And there is two-factor authentication on that site, so the issue may be with that authentication. I typed in Apple ID on my MacBook again, then password and right after the password in the same text field appended the verification code that I used when loging into my account at appleid.apple.com. After that, another red caption appears that says something like 'Invalid Apple ID or password.'
I had no choice but to click on 'Forgot AppleID or password' and try to request password reset, but red caption #3 appeared that said something like 'An unknown error has occured.'
Please, help!
P. S. I tried setting up another admin user account to see if the same problem continues, still can't login to Apple ID.
MacBook Air 13″, 10.13