Thanks for your question.
You need to backup your credentials in authenticator, if this was not done unfortunately you can only resolve this by contacting support or asking your university IT Admin 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