SocketIO 4 - won't emit to the room - socket.io

Question

I have following server code:
const path = require("path");
const http = require("http");
const express = require("express");
const {instrument} = require('#socket.io/admin-ui')
const {jwtDecode, jwtVerify, resignJwt} = require('jwt-js-decode')
const secret =
"xxxxxxx";
const app = express()
const server = http.createServer(app)
const io = require("socket.io")(server, {
cors: {
origin: ["https://admin.socket.io", "http://localhost:3001"],
credentials: true
},
});
let servantID = ''
io.use((socket, next) => {
const header = socket.handshake.headers["authorization"];
jwtVerify(header, secret).then((res) => {
if (res === true)
{
const jwt = jwtDecode(header);
servantID = jwt.payload.iss;
return next()
}
return next(new Error("authentication error"));
});
});
instrument(io, { auth: false });
server.listen(3000, () =>
console.log('connected')
)
io.on('connection', socket => {
socket.on("join", (room, cb) => {
console.log('Joined ' + room);
socket.join(room);
cb(`Joined the best room ${room}`)
});
socket.on('newOrder', function (data) {
socket.to('servant').emit('this', data);
console.log(data);
})
socket.on("thisNew", function (data) {
console.log('this new');
});
socket.on('disconnect', () => {
console.log('user disconnected');
});
})
And client side code:
socket.emit('join', 'servant', message => {
console.log(message)
})
socket.on('this', () => {
console.log('this event')
})
socket.emit('newOrder', 'data')
When I emit like this:
socket.to('servant').emit('this', data);
the client doesn't receive anything, but if I emit without room:
socket.emit('this', data);
the event and data are received on the client side.
What am I doing wrong here?