---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50400#article
headline: "50400: Programmable Chat: User not member of channel"
url: https://www.twilio.com/docs/api/errors/50400
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50400: Programmable Chat: User not member of channel

Log Level: ERROR

## Description

### Possible causes

* Specified User is not member of this Channel.

### Possible solutions

* Confirm a valid User who is Member of this Channel is being passed in request.