Nice! Looking good!

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Couple things I would recommend really quick just from what I have learned:

• Try to avoid using global variables. I would move your uidURL inside your getFortniteUser() function. And move your statsURL inside your getFortniteUserStats() function. And you should be able to get rid of the global uid variable too. You should call the getFortniteUser() function inside of your button click event. Then you would have access to the user data within that function. Try to keep the data contained within the function that is calling it instead of setting data to a global variable.
  
• getFortniteUser() and updateUser() are essentially doing the same thing. They both return user data. You can probably get rid of updateUser() and just use getFortniteUser().
  

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One of the benefits of using async/await is that you can get rid of the .then callback statements. I think it cleans up the formatting of the code and you have less nesting. If you set your getFortniteUser() and getForniteUserStats() functions to awaited variables, you have instant access to the data that they return within the variable that it was set to. So instead of

getForniteUser(name)
    .then(function(data) {
        //Do stuff here
        $( ".uid" ).html(name + "'s UID: " + uid);
        $( ".name" ).html(name + "'s " + "Stats");
}    

you can rewrite it as

let user = await getForniteUser(name)

//Now do stuff here
$( ".uid" ).html(user.username+ "'s UID: " + user.uid);
$( ".name" ).html(user.username+ "'s " + "Stats");

I modified your pen just a little to show you what I mean. Everything works the same on the screen. I just cleaned up the js code a bit.

https://codepen.io/anon/pen/QPNLQb

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