---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50431#article
headline: "50431: Participant SID not provided"
url: https://www.twilio.com/docs/api/errors/50431
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50431: Participant SID not provided

Log Level: ERROR

## Description

Conversation participant SID parameter is required but was not provided.

### Possible causes

* The API expected a participant SID input parameter, but it was either not provided or was misspelled.

### Possible solutions

* Add a valid participant SID parameter to the API request and confirm that it is not misspelled.