---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/80102#article
headline: "80102: Participant Already In Interaction"
url: https://www.twilio.com/docs/api/errors/80102
inLanguage: en
dateModified: 2026-06-08T12:04:59.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 80102: Participant Already In Interaction

Log Level: WARNING

## Description

This warning appears when you try to add a participant to an interaction and that participant has already been added. For SMS and WhatsApp participants, the `address` and `proxy_address` binding can exist in only one non-closed conversation, so trying to add the same participant to another interaction can fail.

### Possible causes

* The participant is already part of the interaction.
* For SMS or WhatsApp, the same `address` and `proxy_address` pair is already bound to another non-closed conversation in the `active` or `inactive` state.
* You created an outbound interaction for a customer who already has an ongoing conversation, so the participant was not added to the new interaction.

### Possible solutions

* Check whether the participant is already in a non-closed conversation before you create the interaction. Use the Participant Conversation Resource to look up existing conversations for that participant.
* If the participant is already in an existing conversation, continue that conversation instead of creating a new interaction for the same binding.
* Create the conversation first and then create the interaction. If the participant add fails, the response returns the conversation SID for the conversation that already contains that participant.

#### Additional resources

* [Interactions API](/docs/flex/developer/conversations/interactions-api)
* [Best Practices for Flex Conversations](/docs/flex/developer/conversations/best-practices)
* [Participant Conversation Resource](/docs/conversations-classic/api/participant-conversation-resource)