Telegram bot doesn't send message to one of my groups

Question

I've built a telegram bot using Node.js to send a text message on specific times. So, I have 2 groups: one for testing and other to actually run it. It runs perfectly on testing group but it doesn't respond when it is supposed to run on my actual group. I've got the both chatId from Telegram Web's link. So what can be possibly wrong?

• Bot is an admin in both groups
• My account is also an admin, but I'm not the creator of the actual group however what I can do everything in my actual group except adding new admins & remain anonymous.
• Disabled privacy settings from BotFather

The code

const telegramBot = require("node-telegram-bot-api");
const token = "THE_API_KEY";
const bot = new telegramBot(token, { polling: true });
const cron = require('node-cron');

let chatId = -111111111;
cron.schedule('59 6 15 * * 2', () => {
    bot.sendMessage(chatId, "some string value");
    },{
      scheduled: true,
      timezone: "Etc/UTC"
    });

cron.schedule('59 1 12 * * 7', () => {
  bot.sendMessage(chatId, "some different string value");
  },{
    scheduled: true,
    timezone: "Etc/UTC"
  });
  
  // The part below this comment line works perfectly fine on both groups
  
  bot.on("message", msg => {
  const chatId = msg.chat.id;
  const message = msg.text.trim().toLocaleLowerCase();
  
  switch (message) {
    case "xx":
      bot.sendMessage(chatId, "text");
      break;
    case "xx":
      bot.sendMessage(
        chatId,
        "text"
      );
      break;
    case "#whoareyou":
      bot.sendMessage(
        chatId,
        "text"
      );
      break;
     }
   });