---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/90009#article
headline: "90009: The message SID already exists."
url: https://www.twilio.com/docs/api/errors/90009
inLanguage: en
dateModified: 2026-03-25T13:47:45.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 90009: The message SID already exists.

Log Type: APPLICATION

Log Level: ERROR

## Description

This error means the request to create a Message resource conflicts with an existing message SID. Twilio identifies each resource with a unique SID, and this error page lists a duplicate message SID as the cause when creating a new message.

### Possible causes

* A message with the same SID already exists, so the new message request conflicts with an existing resource.
* Your integration reused a message identifier instead of creating a unique value for the new message. Twilio uses unique SIDs to identify resources.

### Possible solutions

* Generate a new, unique message SID before you retry the request.
* Make sure your application does not reuse the same identifier when creating messages.
* If you need to inspect an existing message, fetch it with the Messages resource using its SID.

#### Additional resources

* [Messages resource](/docs/messaging/api/message-resource)
* [What is a String Identifier (SID)?](/docs/glossary/what-is-a-sid)