# invalid_agent_key

> The agent key is missing, invalid or revoked.

Source: https://tickwire.io/docs/errors/invalid_agent_key/

HTTP 401. Nothing reached the broker.

**Likely cause:** No X-Tickwire-Agent-Key header, or a revoked key.

**What to do:** Send a valid agent key (twag_...).

**Retry:** No. The same request gets the same answer; change something first.

Listed under [Keys, tokens and permissions](https://tickwire.io/docs/errors/#keys-tokens-and-permissions) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.