How to register my university account to the authenticator app on new device

Question

I recently got a new phone and I am unable to access my emails as it asks me to verify with the Microsoft authenticator app and in the app my university account is not registered and it shows i need permission to register by the university, so how do i do so? The app does ask for a QR code but I do not know where to access that. And also when attempting to register it asks to apply the code  within the app. And my number is still the same. I cannot access any of my microsoft accounts without it asking to apply the code to the authenticator app. I attend the University of South Africa.