---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/80306#article
headline: "80306: Not Found Chat Service"
url: https://www.twilio.com/docs/api/errors/80306
inLanguage: en
dateModified: 2026-06-08T12:04:59.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 80306: Not Found Chat Service

Log Level: ERROR

## Description

This error occurs when the Proxy Service identified by `{ProxyServiceSid}` does not have a Chat Service associated with it. Configure the Service resource with `ChatInstanceSid` before you use Proxy to forward SMS or channel messages to Chat. A Proxy Service maps to one Chat Service instance.

### Possible causes

* The Proxy Service was created or updated without a `ChatInstanceSid`. Twilio lists this property as optional on the Service resource, so workflows that rely on Chat can fail if you leave it unset.
* The `ChatInstanceSid` on the Service does not point to an existing Chat Service instance. Twilio expects this property to contain a valid Chat Service SID with the `IS` prefix.

### Possible solutions

* Update the Proxy Service and set `ChatInstanceSid` to the correct Chat Service SID for your application. Use a valid Chat Service SID that starts with `IS`.
* If the Chat Service was deleted or replaced, select the current Chat Service instance and update the Proxy Service so the one-to-one mapping is restored.
* If you use Proxy with channels, complete that setup against the same Proxy Service after the Chat Service association is configured.

#### Additional resources

* [Proxy API overview](/docs/proxy/api)
* [Service resource](/docs/proxy/api/service)
* [Using Proxy with Channels](/docs/proxy/channels)