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Is there a way to disable Anonymous Access when authenticating to websocket?

"Show us an example of what you mean!". An example can be useful, otherwise we're left guessing!

1. Guest on website
2. Frontend sends api request to backend to refresh token
3. Backend generates a jwt token with empty sub and returns it to Frontend
4. Centrifuge SDK loads the token and tries to connect to the Websocket Server with the provided jwt token from the backend
5. Centrifuge server denies the connection because the sub claim is empty, not allowed

I'd like a way to configure centrifuge to check this instead of doing it by myself with my backend, like

{
  "anonymous_access": false,
  "namespaces": [...]
}