A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
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
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Regards,
Abiola