Microsoft App not reciving verifications codes on iPhone/refueses to unpair

Question

Hello,

Currently, I am trying to help a student get into their Outlook email. The problem involves the Authenticator app on her iPhone as it is not sending a code to the app for her to log in.

So far in her account, I have done the following:

a) Linked her cell phone number and email to her account; it ignores them and goes straight to the app

b) Set SMS Mobile as the primary/default sign method (see a)

c) Did both Revoke multifactor authentication sessions and Requrire re-register multifactor authentication

d) Removed the Authentication App as an option entirely on her account

d) Unpaired the email address in question on the Authentication App on her phone

Any ideas?