Hello Austin Alverth
Thanks for your question.
You will need to contact the IT support team of your school to help prompt a reset of your MFA methos if you do not have access to the app again.
If they do not know what to do, just show them this link: https://learn.microsoft.com/en-us/entra/identity/authentication/howto-mfa-userdevicesettings#manage-user-authentication-options
The reason you need to do is you need to backup your credentials in authenticator, if that was not done unfortunately you can only resolve this by contacting support or asking your admins/support to reset your account https://learn.microsoft.com/en-us/xandr/curate/troubleshooting-multi-factor-authentication-mfa?source=recommendations
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola