---
page_type: error
code: 19023
message: "19023: Invalid channel type"
level: ERROR
product: Programmable Messaging
---

## Description

Request with an invalid channel type

### Possible Causes

- If you are sending rich content and are receiving this error when a message fallback is occurring, a content type that is not supported on the fallback message channel is being used.

### Possible Solutions

- If you are sending rich content such as a card, ensure you also define a twilio/text translation for SMS fallback or twilio/media translation for MMS fallback.