Outlook - Updating Email on Mac for Modern Authentication

To update email on Mac using the Apple mail app for modern authentication the email account must be removed then re added to the device see steps below. 

To remove an email account from an Apple mail  (note this will remove all email data from your device including any synchronized calendar data.) : 

1. Verify your device's data connection is active (open Safari web browser and enable to browse the Internet).
2. Select System Preferences > Internet Accounts
3. Select the account needing to be removed. 
4. Select the Minus "-" to remove the account and accept any prompts to remove.

Proceed to add the account back to your device: 

1. Verify your device's data connection is active (open Safari web browser and enable to browse the Internet).
2. Select System Preferences > Internet Accounts
3. Tap Microsoft Exchange.
4. Tap the Email box and enter your full email address (e.g. myusername@utrgv.edu), and select Sign In.
5. Tap Sign in again
6. At the UTRGV Login screen, if needed tap the Username box and enter your full email address again.
7. Tap the Password box and enter your password and tap sign in,
8. Approve Microsoft MFA if/when prompted. Accept all prompts. 
9. Choose the type of information you want to synchronize. By default, Mail, Calendar, and Contacts are all turned On.
10. Select Done on the upper right corner of the screen.
11. The setup is complete. The email account is now accessible from the Mail application.