Once your account has been enabled to use multi-factor authentication for Office 365, the easiest verification method to use is Microsoft Authenticator as a security token. It's just one click instead of typing in a 6-digit code. And if you travel, you won't incur roaming fees when you use it.
If there is no internet access for your phone, you can use the "verification code" from the app to verify your identity.
Other ways to access Office 365 service with MFA
- Besides, the Microsoft Authenticator app notification, you can use the following ways to identify yourself.
- After you sign in Office 365 and the system is waiting for the request confirmation, you can click "Sign in another way".
- As you do not have internet access on your mobile device, you have to choose "Use a verification code from my mobile app"
- Open the "Microsoft Authenticator" app on your mobile, you will see a 6-digit verification code. Then enter the code on the login screen and click "Verify".