> ## Documentation Index
> Fetch the complete documentation index at: https://docs.relayapp.im/llms.txt
> Use this file to discover all available pages before exploring further.

# 2004: Authentication is missing or invalid

> Authentication is missing or invalid.

`2004` means: Authentication is missing or invalid.

| HTTP status | What to do                                        |
| ----------- | ------------------------------------------------- |
| 401         | Supply a valid Bearer token for this environment. |

## Error response

Relay includes this code in `error.code`. The response also includes `error.status`, `error.message`, and `error.doc_url`; keep `trace_id` when it is present.

## Related

* [All error codes](/api-reference/errors)
* [Debug a request](/live/debugging)
* [Retry a request](/live/retries)