not_sendable API error

The envelope is incomplete and cannot be sent.
The API returns HTTP 422; use requestId to trace the refusal.

{
  "error": "not_sendable",
  "message": "The envelope is incomplete and cannot be sent.",
  "requestId": "req_a1b2c3d4e5f6"
}

What to do

The envelope is incomplete and cannot be sent. Correct the request or state before retrying.

See all errors · OpenAPI contract