# INVITATION_USED: Invitation already used

> Someone has accepted this invitation already. An invitation works once.

Sent by the management API (409). The page: https://coho-cms.com/errors/invitation-used/

## What to do

If it was you, sign in. If not, ask an admin for an invitation of your own.

## The response

```json
{
  "code": "INVITATION_USED",
  "type": "https://coho-cms.com/errors/invitation-used",
  "title": "Invitation already used",
  "status": 409,
  "detail": "What went wrong in this request, in a sentence.",
  "instance": "/v1/projects/…"
}
```

Every error code: https://coho-cms.com/errors/