I continue to get a message that my Apple ID password needs to be updated. I do that and it accepts the change and confirms it with an email. I go back to try to sign in and I get a message that an unknown error has occurred. It keeps me going in circles. I need to get in because there is an important app that needs to be updated.
Mac mini, macOS 10.15
Receiving the message you received is common. But, I have not seen a definitive solution for it. I suggest you use my search link in trying to solve your problem: unknown error apple. You will see a number of links that are, or may be, related to your specific problem.
And, if you want to contact Apple Support to deal with your problem, see:
Get a call from Apple support to help solve your problem using this
link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362
Apple ID Support https://support.apple.com/apple-id
Apple Support Twitter https://twitter.com/AppleSupport
Apple ID account security for country-specific and
region-specific help https://support.apple.com/en-us/HT204169
Get Support: We’re here to help https://getsupport.apple.com/. Go through
the options to find the best one.. You will see a number of links that are, or may be, related to your specific problem.
If you have changed your ID or password, have you followed the steps in this article?
What to do after you change your Apple ID or password - Apple Support.
Applle ID password needs to be updated
