30123: Callback URL is missing

This error occurs when a Messaging configuration or request does not include the required callbackUrl value. In Messaging Link Shortening, the Callback URL is the URL Twilio uses to send click event data after a recipient clicks a shortened link.

• You did not include the callbackUrl field in the request.
• You left the CallbackUrl value out of the Link Shortening domain configuration that Twilio uses for Messaging.

• Add a CallbackUrl value when you create or update the Link Shortening domain configuration. Twilio accepts CallbackUrl in the domain Config subresource.
• In the Console, open the domain configuration and fill in the Click tracking callback URL field, then save your changes.
• If you are using the REST API, include CallbackUrl in the request payload instead of leaving it blank.

• Link Shortening Onboarding Guide
• Services resource