I hope this video can help you:
https://www.youtube.com/watch?v=dRHoId0-8qA
or this article
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I can't log into my sharepoint account because of the authenticator. I try to enter my account in the authenticator since I erase the data from my mobile and to enter my account I need to confirm session in the authenticator and it asks me for confirmation in the same authenticator and I can no longer enter my account, please help