---
page_type: error
code: 50373
message: "50373: No Messaging Service assigned to Conversation"
level: ERROR
product: Programmable Chat
---

## Error - 50373

### Conversations: No Messaging Service assigned to Conversation

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.