720002: the TwiML is invalid

HTTP status

400

Where you see it

HTTP (Twiml=) / StatusCallback

Why it happens

• The document isn't valid TwiML, e.g. it isn't well-formed or its root isn't <Response>.

The error body

{
  "code": 720002,
  "message": "the TwiML is invalid",
  "more_info": "https://docs.dongleswithwings.com/errors/720002",
  "status": 400
}