I made a welcome message but it is not working and gives no errors in the console. All code looks fine to me but it's not working and I don't know why!

welcome.js file code:

module.exports = (client) => {
  const channelId = "906885175617683457";
  const rulesChannel = "874498102139166731";
  client.on("guildMemberAdd", (member) => {
    console.log(member);

    const message = `Welcome <@${
      member.id
    }> to our server! Be sure to check out our ${member.guild.channels.cache
      .get(rulesChannel)
      .toString()}`;

    const channel = member.guild.channels.cache.get(channelId);
    channel.send(message);
  });
};

And index.js file code:

const Discord = require('discord.js');
const client = new Discord.Client();
const welcome = require('./welcome');
client.on ("ready", () => {
   console.log("Our bot is online");
   welcome(client)
   
});
client.login(token);

What am I doing wrong?