# unknown_topic

> The email notification topic does not exist.

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

HTTP 400.

**Likely cause:** A typo in a topic id when saving notification settings.

**What to do:** Use a topic id from GET /dashboard/notifications/preferences.

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

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