In this method, the identities of users are verified through a verification code sent to their mobile number.
Make sure that you've configured SMS Server.
Steps to configure SMS Verification
Log in to the ADSelfService Plus web console with admin credentials.
Navigate to Configuration → Self-Service → Multi-factor Authentication.
From Choose the Policy dropdown, select a self-service policy.
Click the Configuration tab.
Click SMS Verification.
From the Select Type dropdown, select an operation. You can configure different messages for different operations such as reset password, Windows login, etc.
Enter the Subject of the email.
Enter the Message.