MFA for users
Multi-factor authentication (MFA) provides increased security because instead of only using a password, or a code through text, a separate app on your phone is used to verify access. This makes it difficult to hack. When MFA is required, members of the organization can use the Microsoft Authenticator app to securely sign in on their devices.
Use the Outlook app on your devices
When MFA is enforced, the authenticator app serves as a second form of authentication. We also recommend that everyone install and use the Outlook app to access their Microsoft 365 email on their devices. See Download Microsoft Outlook for iOS and Android.
Proceed to install Microsoft 365 Apps.