---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/53200#article
headline: "53200: Participant identity is invalid"
url: https://www.twilio.com/docs/api/errors/53200
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 53200: Participant identity is invalid

Log Type: APPLICATION

Log Level: ERROR

## Description

Raised whenever a Participant identity is invalid, and the scenario is not covered by a more specific error code.

### Possible causes

The Participant identity does not adhere to the Participant identity requirements.

Possible causes:

* The identity is null or an empty string.
* Another Participant with the same identity already exists in the Room.
* The identity has more than 128 characters (NOTE: Double-byte characters are counted as 2 characters).

### Possible solutions

* Choose a Participant identity adheres to the Participant identity requirements.