password to iCloud questioned immediately after you enter (Mac)

Immediately after an update a few months back, that I had to change my password to a stronger one, iCloud began telling me that he had a problem with my account:

When I went to preferences, this happens:

So I type my password (I know the password is) and he accepts...

... For about half a second before immediately returning to the screen:

This was bugs me for months so if someone could help I would be very grateful!

Thank you.

If you enter the password once again it works or just reset and same screen then?

Tags: iCloud

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