"nosub" on stream-notify-room subscription

Community Support
1

Hi, i’ve a problem in realtime api with the subscription to stream-notify-room.

If I try to subscribe to ‘typing’ (an event of stream-notify-room) I receive a ‘nosub’ answer instead of ‘ready’ and therefore I don’t receive notifications about typing.

The user that attempts to subscribe has all permission ( Administration→Permissions).

What do I do wrong? Thanks

Server Setup Information
Version of Rocket.Chat Server: 3.15.0
Operating System: Ubuntu 20.04.2
Deployment Method: snap
Number of Running Instances: 1
DB Replicaset Oplog: Enabled
NodeJS Version: 12.22.1
MongoDB Version: 3.6.14
Proxy: nginx
Firewalls involved: none

import crypto = require('crypto');
import DDP = require("ddp");
import login = require("ddp-login");

const serverPort = ...;
const serverHost = "...";
process.env.METEOR_TOKEN = '...';
const visitorToken = '...';
const secret = '...';
const roomId = crypto.createHmac('sha256', secret).update(Math.random().toString()).digest('hex').substring(0, 17);
const msgId = crypto.createHmac('sha256', secret).update(Math.random().toString()).digest('hex');

const ddpClient = new DDP({
  host: serverHost,
  port: serverPort, 
  maintainCollections: true
});

ddpClient.connect(function(err) {

  if (err) throw err;

  login(ddpClient, {
    env: "METEOR_TOKEN",
    method: "token",
    retry: 5
  },

  async (error, userInfo) => {
    if (error) { ... } 
    else {
         
      await new Promise((resolve, reject) => {
        ddpClient.call(
          'livechat:registerGuest', [{
            token: visitorToken,
            name: "...",
            email: "...",
            department: "..." }], 
						(error, result) => {
            if (error) { return reject(); }
            resolve(result);  
          });
      });

      await new Promise((resolve, reject) => {
        ddpClient.call(
          'sendMessageLivechat', [{
            _id: msgId,
            rid: roomId,
            msg: "...",
            token: visitorToken }], 
						(error, result) => {
            if (error) { return reject(); }
            resolve(result);  
          });
      });
      
      ddpClient.subscribe("stream-notify-room", [roomId+"/typing", false], () => { ... } );    
    }
  });
});

ddpClient.socket.on('message', (msg) => { 
  const data = JSON.parse(msg.data);
  console.log(data);
});```