Did you resync the authenticator yet? How about running a Malware scanner. There seems to be some new malware possibly circulating that prevents an account using an authenticator from completing the logon. Users in the course of troubleshooting may remove the authenticator which can result in the account being stolen as it's no longer protected. This is not considered a Man in the Middle trojan, it's something else as the auth code is not being hijacked.
I believe Malwarebytes has been successful in detecting it so I'd run that at a minimum.
The free trial is sufficient. Be sure to update it before running and do a full scan, not the short one.
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