Sounds like you have federated auth and things are not setup correctly in AADConnect or werent enabled in the wizard..
Have you enabled password hash sync in AADConnect?
You should enable that if not.
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We recently enable Azure AD sync and since then some users are getting stuck in a log on loop if the move to a different pc. It also havens even if they are at home or if the use a browser and 4G on their phone.
They get error 50056 on the log on logs. Users are getting there passwords correct.
They just go round in circles entering passwords and usernames but can never log on.
Sounds like you have federated auth and things are not setup correctly in AADConnect or werent enabled in the wizard..
Have you enabled password hash sync in AADConnect?
You should enable that if not.