Facebook Messenger Bot Message is not coming to server

I have setup the Facebook Messenger by following correct steps. I could verify the webhook successfully as well as subscribed to the page. But when I am sending a message to the bot, its not coming to the server.

I noticed in the Facebook App settings, the graph API version is 3.3 I have other bot running successfully with v2.9

What can be done to make the bot running?

Webhook successfully registered:

const verifyWebhook = (req, res) => {
    let VERIFY_TOKEN = 'lumicentco';
    let mode = req.query['hub.mode'];
    let token = req.query['hub.verify_token'];
    let challenge = req.query['hub.challenge'];
    if (mode && token === VERIFY_TOKEN) {
        res.status(200).send(challenge);
    } else {
        res.sendStatus(403);
    }
};
module.exports = verifyWebhook;

Message-webhook.js

const processMessage = require('./process-message');
module.exports = (req, res) => {
  if (req.body.object === 'page') {
    req.body.entry.forEach(entry => {
      entry.messaging.forEach(event => {
        if (event.message && event.message.text) {
          processMessage(event);
        }
      });
    });
    res.status(200).end();
  }
};