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Hi Klinger, Clair E
I understand how frustrating this must be, especially when you're unable to access your school account.
May I know if you are still able to sign in to your account using any alternative sign-in method, such as SMS?
If yes, you could access to this link: https://mysignins.microsoft.com/security-info to delete old Authenticator (if you had) and then register for new MFA on Microsoft Authenticator again.
If no, I recommend that you contact your organization’s administrator or IT department and ask them to follow this article to reset MFA for you: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |…. After that, you'll be able to register Microsoft Authenticator again.
For security and management reasons, only your organization’s IT administrators can manage access and MFA settings for work or school accounts. Microsoft Support cannot directly reset MFA for accounts that are managed by an organization.
Once you regain access, it's a good idea to set up an additional sign-in method if your school allows it (such as phone or email), so you’ll have a backup option in case something like this happens again.
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