I have the exact same problem and the 'fix' did not work. Please advise of any other options/solutions. Many thanks.
I've had the exact same issue. I just came across this:
Which is also discussed in more detail here: https://answers.microsoft.com/en-us/windows/forum/all/systemwide-password-amnesia-v2004-build-19041173/232381f8-e2c6-4e8a-b01c-712fceb0e39e?LastReply=true#LastReply&page=29
I just tried the fix - we'll see how it goes, but multiple people have reported it being successful.