Safari fails to log-in on all sites
Some days ago, after Apple ID password changing, Safari (MacBook Pro, 13'', 2017, macOS Big Sur, 11.4) started to refuse to log-in on all sites: Facebook, gmail, ... any site. It's impossible to log-in anywhere: I see box with account name/password (from Keychain), I can put both of them in requested fields, but then I press 'Sign In' button — and error message very time (errors from site side, not Safari system message). Even if I try to enter username/password manually — still the same situation.
Google Chrome and Opera still works fine on Mac.
Safari on iPhone works fine. I face this problem only with Mac.
Maybe there is a chance that anyone knows how to solve this? )