80908: Callback Error

This warning indicates that a request to the callbackUrl configured on your Proxy Service failed. Proxy uses callbackUrl to send informational webhooks for new interactions and interaction status changes.

• The callbackUrl on your Proxy Service is invalid, points to the wrong route, or is no longer reachable from the public internet.
• Your endpoint does not handle Proxy webhook requests as application/x-www-form-urlencoded data, or it does not return HTTP 200 OK for this informational webhook.
• Your endpoint returns a 4xx or 5xx response, times out, or fails during connection or TLS handshake setup.

• Verify that the Proxy Service callbackUrl is correct, publicly accessible, and updated to the exact route that should receive interaction callbacks.
• Update your webhook handler to accept Proxy form parameters and return HTTP 200 OK after you process the callback.
• Open the URL directly in a browser or send a mock request to confirm that the route does not fail or redirect unexpectedly.
• Check the Debugger or Twilio Workbench to review the logged warning and inspect the HTTP request and response for the callback attempt.
• If intermittent network issues are causing failures, add webhook connection overrides to adjust timeout and retry behavior for the callback URL.

• Proxy webhooks
• Proxy Service resource
• Debugging your application