Cannot Update Apple ID Settings - Handoff and Sidecar not working.
Just updated my 2017 iMac to Catalina yesterday. I've noticed that there's always a red dot on the Apple ID preference in Settings. When I go in to that, I enter my Apple ID password over and over. I don't know what's not working here [Update Apple ID Settings. Some account services will not be available until after you sign in again ] - it just doesn't accept the password.
I noticed that Handoff doesn't work (can't see open web pages on other devices) and when trying to use Sidecar with a 2018 iPad Pro it fails to connect.
I presume the next step should be sign out of iCloud and sign back in. When I do so, I get a message to save a copy of my data on my iMac. I choose to save the copy then I get a message that says iCloud Drive needs to finish updating before continuing with sign out - Downloading 1200 items. (XXMB of 54.34 GB). So that part sucks.
Any other thoughts as I wait for 54GB of data to slowly sync?
iMac Line (2012 and Later)