Discord.js bot doesnt relpy to message

Question

I've written this bot to respond to a message with a prefix. The bot works, it connects to the server but it just doesn't reply to my message.

I don't understand why that is...

This is my code:

const { Client, GatewayIntentBits } = require('discord.js'); 
const config  = require("./config.json");

const client = new Client({
  intents: [
    GatewayIntentBits.Guilds,
    GatewayIntentBits.GuildMessages,
    GatewayIntentBits.GuildMessageReactions,
    GatewayIntentBits.GuildMessageTyping,
  ]
}); 

client.on("ready", () => {
    console.log("Bot is online!");
});

const prefix = "!";

client.on("message", message => { 
    if (message.author.bot) return;
    if (!message.content.startsWith(prefix)) return;

    const commandBody = message.content.slice(prefix.length);
    const args        = commandBody.split(" ");
    const command     = args.shift().toLowerCase(); 
    if (command == "ping") {
        message.reply("pong");
    };
});       


client.login(config.BOT_TOKEN);

I think it has something to do with the version.