Issue a one-time password that can be used to step-up a token

Initiates the step-up token process by sending an SMS with an one-time-password to a device belonging to the logged-in user that was previously enrolled through /authentication_factors/otp/{channel} endpoint.

This process is required for endpoints that require a step-up token to complete the call.

Note that on the Sandbox Environment, text messages are not sent and the one-time-password is always "123456".