Namespace in channels

I have different apps that all use a shared socketcluster server for PubSub.

I want to separate each app's channel names to prevent conflicts so I can have the same channel names for different apps.

I tried to prefix the channel name with the app ID on the subscribe middleware on the server - something like app1/my-channel, app2/my-channel - but not luck.

I know that I can just subscribe to app1/my-channel channel from the client but in this case, it is not suitable for me and I want to let clients just subscribe to my-channel and the server handle the namespacing based on my client app.

How can I do namespace channels to achieve this or any other solution?

Here is my code that not working:

agServer.setMiddleware(
    agServer.MIDDLEWARE_INBOUND,
    async (middlewareStream) => {
        for await (let action of middlewareStream) {
            if (action.type === action.SUBSCRIBE) {
                    action.channel = `${appId}/${action.channel}`;
                }
            }
            action.allow();
        }
    }
);

Start by reading the inbound middleware setup around agServer.setMiddleware and the SUBSCRIBE action in the example. Trace whether changing action.channel can affect server-side channel routing, then determine whether the requested per-app namespacing is supported. Done means documenting a working approach or a clearly scoped implementation path for clients subscribing to my-channel.