When an Enable the SMS method of identity verification option is disabled, the 5-digit verification code will be sent via email by default each time a user tries to log in from an unauthenticated IP address.
How to verify the SMS method:
If Enable the SMS method of identity verification is disabled,
1. Click on top right Gear | Setup Home | Users | Profiles
2. Click Edit
3. From General User Permission section, the Email-Based Identity Verification option will be missing.
Related article:
Methods for Verifying Your Identity
SMS method of Identity Verification
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