57009: 'EventType' is too long

Twilio returns this error when the EventType value in a Messaging webhook or status callback exceeds the accepted length. EventType is one of the fields Twilio includes in outbound message status callback requests for supported messaging channels.

• The EventType value in the request is longer than Twilio accepts.
• Your webhook or callback payload includes extra text or formatting instead of the supported event identifier. This is an inference from the error and the documented callback shape.

• Send the documented EventType value exactly as required for the webhook or callback you are using.
• Remove any appended labels, whitespace, or other formatting before you send the request to Twilio. This is an inference based on the length error.
• If you are tracking outbound message delivery, use the Messaging webhook and status callback flow and make sure your endpoint handles the parameters Twilio sends.

• Messaging Webhooks
• Outbound Message Status in Status Callbacks
• Track the Message Status of Outbound Messages