57018: 'Event' value type must be Map

Your request sent the Event field with the wrong type. Twilio expects Event to be a map, so this error appears when the request includes a non-object value. Messaging event payloads in Event Streams are published as JSON objects with nested data objects.

• You sent Event as a string, array, number, or other non-map value.
• The request body does not match the JSON object structure used by Messaging event payloads.

• Send Event as a JSON object/map with key-value pairs, not as a scalar or array.
• Compare your payload with the published Event Streams examples and correct any field types before you retry the request.
• Use the debugging guide to inspect the request body and confirm the Event field is being serialized correctly.

• Set Up A2P 10DLC Event Streams
• Debugging Your Twilio Application