48001: Callback URL is not set

You tried to use a Frontline feature that requires a Callback URL, but no Callback URL is configured for your Frontline setup. Configure the Callback URL in Frontline before retrying the request.

• No Callback URL is configured in Frontline.
• The Frontline configuration is incomplete for the feature you are trying to use.
• Your application is calling a Frontline workflow or action that depends on a configured Callback URL.

• Open the Frontline configuration for your account and add a valid Callback URL.
• Verify that the Callback URL points to an endpoint your application serves and can receive requests on.
• Confirm that the URL is correctly formatted and uses a publicly reachable https endpoint if your integration requires it.
• Retry the request after you save the updated Frontline configuration.

• Frontline documentation
• Twilio IAM documentation