JDA getGuildById() returning null

I am attempting to construct my first java bot, and while attempting to set up a slash command exactly as the tutorial I'm following says to, I've been running into this issue where the return value of "net.dv8tion.jda.api.JDA.getGuildById(String)" is null. I am using the server ID of the server I'm testing the bot in and {myId} is the placeholder. {myToken} is a placeholder as well. Please help! 😭

import javax.security.auth.login.LoginException;

import commands.BotCommands;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.JDABuilder;
import net.dv8tion.jda.api.entities.Activity;

public class DiscordBot {
    
    public static void main(String[] args) throws LoginException, InterruptedException {
        JDA jda = JDABuilder.createDefault("{myToken}") 
                .setActivity(Activity.watching("you sleep"))
                .addEventListeners(new BotCommands())
                .build();
        
        if(jda.getGuildById("{myId}") == null) {
            System.out.println("null");
        }
        
        jda.getGuildById("{myId}").upsertCommand("schedule", "Schedule a time to kick a user from a voice channel").queue();
        
        
        
    }
}

I used that if statement to check if getGuildById() was returning null, and it is.

As the answer states all you really gotta do is call awaitReady()
to block the main thread until JDA is ready.

Here's the documentation for it if you're curious documentation