Socket.io my middleware for custom Id does not works - node.js

Question

i followed instructions in this link Rohit Nishad and my data is well passed from client to server.
But the ID is not passed from my middleware with the overwritten function. A new Generated ID is shown on socket.io connection.
Any idea what's going wrong please ?
I'm using socket.io v3.1.0
server.js
const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const socketIO = require('socket.io');
const io = socketIO(server, {
cors: {
origin: "http://localhost:4200",
methods: ["GET", "POST"]
},
});
// Socket.io configuration
io.of('/notification').use((socket, next) => {
console.log('(socket.handshake.query.userId) :', socket.handshake.query.userId);
io.engine.generateId = (req) => {
socket.handshake.query.userId;
};
next(null, true);
});
io.of('/user').use((socket, next) => {
io.engine.generateId = () => socket.handshake.query.userId;
next(null, true);
});
io.of('/notification').on('connection', socket => {
console.log('[Notification] - New client connected : ID ', socket.id);
});
io.of('/user').on('connection', socket => {
console.log('[User] - New client connected : ID ', socket.id);
});
const serverPort = process.env.PORT || port;
// Launch server
server.listen(serverPort, () => {
console.log(`App is running ! Go to http://${host}:${port}`);
});
and console output:
App is running ! Go to http://localhost:3000
(socket.handshake.query.userId) : 5ffdb966c204c85d4061bf9f
[Notification] - New client connected : ID EjdB0uz8K7NSGWYyAAAB
[User] - New client connected : ID E4tu9sKXliWTFEcsAAAC