---
page_type: error
code: 45351
message: "45351: Invalid Channel Participant properties."
level: ERROR
product: Flex
---

## Description

Failed to add Participant to Channel . Channel Participant properties must contain exactly one of "identity" or an "address"/"proxy\_address" pair.

### Possible Causes

A create Conversation or add Participant request was made with a Participant having both or neither of identity and address specified.

### Possible Solutions

Specify either identity or address for Participants