Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello drhelpmeplease,
Good day and thank you for posting to Microsoft Community.
I'm sorry to hear that you can't use your account due to AUTH issues. Based on your description, you may need to contact your school's M365/IT administrator to reset MFA for you through the Azure admin portal. In the Azure portal, the administrator can set your account to Require new MFA registration, so that when you sign in the next time, you will be prompted to configure a new MFA authentication method. The administrator can also allow your account to use another authentication method like phone or SMS such that you can have other options other than the authenticator app.
More info at: Manage authentication methods for Azure AD Multi-Factor Authentication - Microsoft Entra | Microsoft Learn
You may as well reach out to our authenticator app team directly by posting the query in Microsoft Authenticator - Microsoft Q&A. I am sure that our experts from that team can address your query effectively and accurately.
Thank you for your kind understanding and have a wonderful day.
Best regards
Ashraf.