This is how to set up two factor authentication with your Microsoft 365 account, if your tenant has Security Defaults enabled. This process needs to be done within 14 days. Once completed, you will occasionally be required to use the Authenticator app to confirm your identity when logging in.




Next, you will be prompted to add a phone number as an alternative authentication method. This is useful if you don’t have your phone or have replaced it.
We also recommend going into the Authenticator app settings and turning on iCloud Backup (iPhone) so you can recover the app configuration if you lose your phone.
You can always change this information later by visiting https://aka.ms/mfasetup.
If you have changed your phone and are unable to access your account, see Gaining access to your Office 365 account if you have replaced your phone and have MFA enabled.
