If you’re not getting the notifications of a push to your Microsoft Authenticator app when you’re trying to access a Microsoft service such as Email or OneDrive, you can go to your Microsoft Authenticator app and request a code to enter onto your computer so that you can provide that second factor.
If this doesn’t help, please contact the Technology Help Desk at 562-985-4959 for assistance with resetting your MFA and re-registering your device.