Voice User-Defined Message: Request to subscription callback URL encountered error
WARNING: 32711
PROGRAMMABLE VOICE
WARNING
Description
Twilio received an error response when attempting to send a User-Defined Message event to the UserDefinedMessageSubscription callback URL.
Possible Causes
The UserDefinedMessageSubscription callback URL is incorrect.
Your endpoint at the UserDefinedMessageSubscription callback URL was not responding or responded with a 400- or 500-level HTTP status code.
Possible Solutions
Make sure that the UserDefinedMessageSubscription callback URL is correct.
Make sure that your endpoint at the UserDefinedMessageSubscription callback URL can successfully receive and respond to requests with 200-level HTTP status codes.