Safari does not fill in passwords, Usernames and passwords checkbox in AutoFill is greyed out.
Since a couple of days ago Safari 14.0.3 on macOS 11.2.3 no longer shows me the prompt to fill in passwords in webpages, and the preferences for AutoFill show "Usernames and passwords" greyed out.
As hinted by https://discussions.apple.com/thread/252064825?answerId=253992260022#253992260022, I have tried to disable and enable TouchID for password filling, and even reconstructed my fingerprints, but no chance.
I'd like to avoid disconnecting this device from Apple ID and connecting it again, but I will try that next, if I don't get any other suggestions.