CUNY Central recommends installing and using the Microsoft Authenticator app as your primary verification method, but you can choose alternatives such as the Microsoft Outlook mobile app (install), Google Authenticator, SMS/Text message, or voice/phone call during the setup process. You only need to complete the MFA setup process once, and it will be applied to all Microsoft 365 applications on all your devices.
You can add your office phone number with an extension as a verification after your initial MFA setup.
See CUNY’s Microsoft Multi-Factor Authentication page for more information.