---
title: "Add a participant to an iMessage group"
method: POST
path: "/v1/imessage/groups/{conversationId}/participants"
tags: ["iMessage"]
---

# Add a participant to an iMessage group

`POST /v1/imessage/groups/{conversationId}/participants`

Applied asynchronously by the provider; the participant list on the next group webhook reflects it.

## Path parameters

- `conversationId` string, required

## Request body

- object
  - `accountId` string, required
  - `contact` string, required — E.164 phone or iMessage email

## Response `200`

Change accepted

- object
  - `success` boolean
  - `conversationId` string
  - `contact` string

## Other responses

- `400` — Bad request, or the conversation is not a group thread
- `401` — Unauthorized
- `404` — Account or conversation not found

## Changes

- **2026-09-21** `339f59df69dd` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/zernio/apis/zernio-api/changes/v1/imessage/groups/:conversationId/participants/post.md)

---

[API](https://skmtc.dev/zernio/apis/zernio-api.md) · [All operations](https://skmtc.dev/zernio/apis/zernio-api/llms.txt) · [OpenAPI document](https://skmtc.dev/zernio/apis/zernio-api/revisions/106013ac73b8?raw)