---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50211#article
headline: "50211: Identity parameter not acceptable for this Participant"
url: https://www.twilio.com/docs/api/errors/50211
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50211: Identity parameter not acceptable for this Participant

Log Level: ERROR

## Description

Participants on SMS, WhatsApp or other non-Chat channels cannot have Identities.

### Possible causes

This error is fired when the parameter *Identity* is provided together with either:

* MessagingBinding.Address,
* MessagingBinding.ProxyAddress, or
* both of the above.

As the error indicates, such a combination is not allowed. You can provide either an address binding or an Identity, but not both.

### Possible solutions

* Avoid using both Identity and MessagingBinding.Address parameters when creating a Conversation participant. Instead, distinguish the use-case for your participants upfront and supply either the Identity for users of Programmable Chat Web/iOS/Android SDKs, or MessagingBinding.Address for non-Chat users such as SMS, MMS, WhatsApp, etc.