Voice MFA Issues with Twilio

Email, Voice, SMS IntegrationsMulti-factor Authentication

Last Updated: Feb 20, 2026

Overview

When users from Quebec, Canada, get a Voice MFA message, the numbers returned are ordinal (1st, 2nd, 3rd as opposed to being read 1,2,3, etc.). Can Auth0 assist with this issue and have the correct phone number format read out to end users?

Applies To

Voice MFA
Phone number

Solution

Auth0 does not directly handle this issue since Twilio is the service that sends SMS or Voice Message codes to users.

This Twilio documentation has been helpful in resolving this issue. NOTE: The advice given by Twilio in the documentation is a configuration update made in Twilio and does not involve the Auth0 dashboard.