If you need to update the phone number for your Multi-Factor Authentication (MFA), first try to log in to your MFA account to change your method to your new phone number. https://libguides.madisoncollege.edu/technology/azure If you've already set up your MFA with text message, then a message will be sent automatically to your old phone for authentication.
However, you will probably not be able to use the old phone for MFA verification as you won't get the message. If you set up another method of verification, such as the Microsoft authenticator app you may be able to authenticate that way by choosing 
If you do not have any other methods set up that you can access, call us at 608.243.4444 during Truax Library open hours to assist with updating your phone number.