Using Outlook for Android in educational settings for communication and organization
Dear Justin,
Good day! Thank you for posting to Microsoft Community. We are happy to assist you.
Based on your description,you're having trouble signing in to your University account. Since you could not use your old phone number, you're unable to use your authenticator app or receive a code via SM. The best way is to reset your MFA option, so that you can re-configure it with a new phone number when you login the next time.
Please refer to the inofrmation below:
Since the education accounts are manged by the tenant admins(IT department) in the schools/collages/Universities, please contact your administrator to follow the steps in Manage authentication methods for Azure AD Multi-Factor Authentication - Microsoft Sign In | Microsoft Learn to reset your MFA option. After reseting, you would be required to set the MFA again when you login to O365 Portal.
For your reference: How do I find my Microsoft 365 admin? - Microsoft Support.
If there is any update or I misunderstand you, please feel free to let me know. I will continue to assist you. Your understanding and co-operation are highly appreciated.
Thanks for your precious time. Have a nice day!
Sincerely,
Sherry | Microsoft Community Moderator
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