公会成员添加不起作用(discordjs)

I have a code where if someone joins the bot gives a welcome message but when a user joins, the bot does not give the welcome message.

代码:

bot.on('guildMemberAdd', member => {

    const channel = member.guild.channels.cache.find(channel => channel.name === "general")
    if (!channel) return;

    const joinembed = new Discord.MessageEmbed()
    .setTitle(`A new member just arrived!`)
    .setDescription(`Welcome ${member} we hope you enjoy your stay here!`)
    .setColor("#FF0000")

    channel.send(joinembed)
});

我的机器人拥有所有权限并且位于角色层次结构的最顶端，请帮助我不知道我做错了什么.当用户离开时也会出现此问题(它也不会给出欢迎消息)