MFA is a security measure that requires users to provide an additional form of identification when signing in. This can be a code on their phone, a fingerprint scan, or other method. MFA can block more than 99.2% of account compromise attacks.
Use the Microsoft Authenticator app-
The Microsoft Authenticator app is free and can be used to sign in to accounts without a password. You can use it for:
Two-step verification, which uses a one-time password code to increase account security
Going passwordless, which uses your phone to approve sign-in