Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I’m sorry you’re stuck in this authentication loop. Because this is a school-managed account, the available sign-in and verification methods are controlled by your school’s security policies. Please contact your school’s IT help desk or Microsoft 365 administrator and ask them to:
- Check the authentication methods registered to your account.
- Require you to re-register for multifactor authentication (MFA).
- Revoke your current sign-in sessions if necessary.
If the sign-in page offers Sign in another way, you may try an existing alternative method. Otherwise, your school’s IT team will need to reset the registration for you. Microsoft advises users with work or school accounts to contact their organization’s help desk when two-step verification problems cannot be resolved.
Please refer them the following article:
Manage user authentication methods for Microsoft Entra multifactor authentication
After the reset, you should be able to sign in and set up Microsoft Authenticator again using the method permitted by your school. Avoid removing the account from Authenticator until the school’s IT team confirms the reset.
I’m just another user on this forum, not a Microsoft employee, but your school administrator is the appropriate contact because they manage the account and its authentication requirements.
Please keep me updated.