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There could be multiple reasons why a Django Channels WebSocket may result in a 404 error. Here are a few possible causes:

1. Invalid URL pattern: Make sure that your WebSocket URL is correctly defined in the routing.py file using the websocket_urlpatterns list.

2. No ASGI application is mounted at the specified WebSocket URL: Double-check that you have instantiated ASGI instance in the main routing file and that it's mount the application in the specified WebSocket URL.

3. Misconfigured Django settings: Ensure that you have correctly configured the Django settings file, including the ASGI_APPLICATION and INSTALLED_APPS settings.

4. HTTP error codes: Check if the WebSocket URL is not being served under some other protocol other than ws:// or wss://.

5. Misconfigured WSGI server: Make sure that your WSGI server is correctly configured to serve WebSocket requests.

6. Misconfigured socket server: Check whether the socket server is started correctly and listening on the specified port.

7. Connectivity issues: Check that both the client and server have internet connectivity and are not behind a firewall which may be blocking WebSocket traffic.