I'm pretty new to Discord.js and Stackoverflow. So I don't know exactly how to do this.

I do know that this question has been asked many times, sadly any I've found haven't worked.

I'm trying to assign roles to members on their birthday. I want to do this with a crontab.
Now I have their user ID's but sadly when I request the member with this code.

let guild = client.guilds.cache.get('Guild ID');

let member = guild.members.cache.get('User ID');

console.log(member);

I just get an undefined message. Now I know that the user ID is correct. I just don't know why I get the undefined message.