4008: Sender is not eligible to send this message

The sending line was blocked from sending this message before the send was attempted — an eligibility check on the sender rejected it. Delivered asynchronously as a message.failed webhook; the message will not be delivered. Failures of this class were previously reported under the generic 4001.

• Check the sender line’s status in your dashboard
• If the line looks healthy and this persists, contact support with the message_id