When legacy (basic) authentication is disabled, accessing email through the Android mail app may not work. ITS recommends using the Outlook app, but you may use the alternative methods below to access your SU email using modern authentication.
...
ITS Preferred Outlook App Instructions for Android Mobile
Other Methods for Accessing your SU Email
Option 1 – Gmail app:
Option 2 – Outlook on the web:
Your SU email can always be accessed through Outlook on the web
...