Problem statement
We want to use an Alphanumeric Sender ID when sending MFA SMS rather than a phone number.
Symptoms
Some countries prefer alphanumeric sender IDs over phone numbers for MFA SMS. Based on the user’s country, we want to use different mechanisms for the MFA SMS.
More about Alphanumeric Sender IDs here:
Solution
With SMS MFA, you can choose the “Use Messaging Service” option as the “SMS Source” in the Auth0 dashboard. This will let you use Twilio Messaging Service, which can dynamically change the source (between the phone number and the alphanumeric code) depending on the country:
Another option would be to use a Send Phone Message Action.