# Join a suggested organization

`POST /fapi/v1/me/organization-suggestions/{domain_id}:join` · called from the environment's sign-in host

Accepts a suggestion from [List my organization suggestions](/docs/api/fapi/me/organization-suggestions/list): the authenticated user becomes a member of the suggested organization with the environment's default member role. The membership's source is `domain_capture` and the user is recorded as the actor; an `organization_membership.created` event is sent. Of two simultaneous joins, only one succeeds. Joining does not require a recently verified session: it grants only the default member role, and only for a domain whose address the user has verified. Requires the authenticated user's `__Host-idp_session` cookie; if the cookie is missing, expired, or revoked, returns `401 unauthenticated`. A first-party app on another origin can instead send its front API access token (`Authorization: DPoP <token>` with a DPoP proof; see [Front API access token](/docs/api/fapi/front-api-token)).

With `@keenauth/js`: `await keenauth.organizations.joinSuggestion(id)`.

## Request

Headers:

| Header | Required | Description |
| --- | --- | --- |
| `Idp-Client` | yes | SDK identifier. |
| `Origin` | yes | Must be exactly `https://<sign-in host>`. |

`domain_id`: the suggestion's `id` (`odm_…`).

No body (an empty JSON object is accepted).

## Response

`200 OK` with `{"membership_id": "mem_…", "organization_id": "org_…"}`.

## Errors

| Status | Code | When |
| --- | --- | --- |
| 401 | `unauthenticated` | No valid session cookie or front API access token. |
| 403 | `origin_not_allowed` | `Origin` is missing or wrong. |
| 403 | `role_not_assignable` | The default member role cannot be granted by domain capture. |
| 403 | `user_not_active` | The user is not active. |
| 404 | `not_found` | The domain is not a suggestion for this user (unknown, malformed, not in `suggest` mode, no verified address in it, or dismissed three times). |
| 409 | `membership_already_exists` | The user already has a membership in the organization. |
| 409 | `organization_disabled` | The organization is disabled or being deleted. |
| 409 | `membership_limit_reached` | The user has reached their membership limit. |
| 409 | `organization_membership_limit_reached` | The organization has reached its membership limit. |
| 503 | `temporarily_unavailable` | The membership directory did not answer; retry later. |

## Example

```bash
curl -X POST https://example.keenauth.app/fapi/v1/me/organization-suggestions/odm_01j9a5c4000000000000000001:join \
  -H "Idp-Client: my-app/1.0.0 (node/22.0.0)" \
  -H "Origin: https://example.keenauth.app" \
  -b cookies.txt
```

```json
{
  "membership_id": "mem_01j9yyyyyyyyyyyyyyyyyyyyyy",
  "organization_id": "org_01j9xxxxxxxxxxxxxxxxxxxxxx"
}
```

## Personal data

This endpoint carries personal data: organization memberships and invitations. [Personal data in the KeenAuth APIs](/docs/policies/personal-data) describes what is stored, how long it is kept and how it is deleted. Do not send special categories of personal data (health, biometric data, religion, political opinions, sexual orientation) in any field.