
Dear Whitney,
Thank you for reaching out to the Microsoft Community. I understand how annoying it can be to get stuck in a loop with Microsoft Authenticator, especially when trying to access shared files from external clients.
To help you more effectively, could you please confirm whether you're using a personal Microsoft account (e.g., Outlook.com, Hotmail.com) or a business/work account (e.g., part of Microsoft 365 for your organization)?
If your account is a business/work account, I would recommend you contact your work account's Admin to reset your MFA settings through the Microsoft Entra Admin Center. Ask your administrator to follow these steps:
Revoke MFA sessions and require re-register in the Microsoft Entra admin center
I hope my information helps! Please don't hesitate to reach out again for further assistance.
As other users will also search information in this community, your valuable vote will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.
Greatly Appreciate again for your patience and understanding.
Best Regards,
Killian-N - MSFT | Microsoft Community Support Specialist.