14231: Dial->Conference: Provided Attributes was not valid JSON

This error occurs when the Attributes value provided for a TaskRouter-integrated <Dial><Conference> flow is not valid JSON. TaskRouter task attributes must be expressed as JSON, and TaskRouter uses task attributes when routing work and handling conference instructions for voice tasks.

• The Attributes value is not valid JSON.
• The task attribute payload is malformed instead of being sent as a JSON string. TaskRouter task attributes must be expressed in JSON.
• The JSON was escaped or double-serialized before Twilio received it.

• Update the Attributes payload so it is valid JSON before you send the request or return the TwiML.
• If you create or update the related Task directly, send attributes as a JSON string. For example, { "task_type": "call", "twilio_call_sid": "CAxxx" }.
• If you use TaskRouter conference instruction for a voice task, include the minimum task attributes {"call_sid":"<callsid>","to":"<E.164 to number>"} and keep the full payload valid JSON.
• If your application serializes the payload before sending it, make sure the JSON is not escaped.

• Task Resource
• Task Reservation Resource
• TwiML <Dial>