11300: Invalid template URL

This error means the URL template you provided is not in a valid format. A common cause is an unclosed bracket in the template.

• The template contains unclosed { or } brackets.
• The template is not a fully qualified URL and is missing required parts such as the protocol, hostname, path, or properly URL-encoded query parameters.
• The URL points to a local or private address that Twilio cannot reach from the public internet.

• Review the template and close any unmatched brackets before you save or submit the URL.
• Update the template to use a fully qualified http:// or https:// URL with a valid hostname, path, and properly URL-encoded query parameters.
• Make sure the endpoint is publicly reachable. If you are testing locally, expose your application through a public HTTPS tunnel before you configure the webhook URL.
• Review the Twilio Debugger to inspect the failing webhook request and confirm which URL Twilio attempted to use.

• Getting Started with Twilio Webhooks
• Webhooks Overview
• Twilio Debugger