---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50373#article
headline: "50373: No Messaging Service assigned to Conversation"
url: https://www.twilio.com/docs/api/errors/50373
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50373: No Messaging Service assigned to Conversation

Log Level: ERROR

## Description

This Conversation does not have an assigned Messaging Service, therefore cannot accept non-chat participants.

### Possible causes

* You may be attempting to add a non-Chat participant (e.g. on SMS) to a channel from Programmable Chat. As Chat precedes the Conversations product, these channels first need to be provided a Messaging Service before they can access SMS, WhatsApp, or other channels.

### Possible solutions

* Update the Conversation with any existing Messaging Service SID on your account. After that, you will be able to add non-Chat participants and continue the conversation with them involved.