Socketio Cross-Origin Request Blocked error with PM2

What's going wrong?

I am using PM2 with cluster mode for my node application. I follow socketio code example (https://socket.io/docs/v4/cluster-adapter/#With-PM2 ).

After that I am getting Cross-Origin Request Blocked error. If I run application on two node, then I am getting 200 for some request and for rest getting error.

I also follow socketio documentation (https://socket.io/docs/v4/handling-cors/) to resolve this issue but no luck. following is my code for that

 const httpServer = createServer(app);
 const io = new Server(httpServer,{
 cors: {
    origin: ["*"],
    methods: ["GET", "POST"],
    credentials: true
 },
 transports: ["polling"],
 allowEIO3: true
 }); 

Start with the PM2 cluster adapter example and Socket.IO's CORS documentation linked in the issue, then reproduce the behavior with two Node processes, polling, and the shown server options. Done means identifying whether the intermittent CORS failures come from PM2 clustering or the Socket.IO configuration and documenting a verified resolution.