# Enroll SMS MFA

Enroll a user in SMS-based multi-factor authentication (MFA).

This endpoint initiates SMS MFA enrollment by sending a verification code to the user's phone number.

Request body must include:
- phoneNumber: The user's mobile number in international format. Must match the validation pattern defined by phoneNumberRegexp.

Use this endpoint to begin the SMS MFA setup process for a specific user. The next step is to verify the SMS code to complete enrollment.

Endpoint: POST /resources/users/v1/mfa/sms/enroll
Security: bearer

## Header parameters:

  - `frontegg-user-id` (string, required)
    The user ID identifier

## Request fields (application/json):

  - `phoneNumber` (string, required)


## Response 200 fields