I have been trying to get the same code I have on my old server to work on my new server. This is the code I have thus far:

function enqueue_load_fa() {
wp_enqueue_style( 'load-fa', 'https://use.fontawesome.com/releases/v5.5.0/css/all.css' );
}

The issue I am having is that on my test site http://thedroidgamer.info/2018/11/25/hello-world/ it is not working but on my other one it is. See screenshot below:
https://scrnshot.app/DfNnwwV3ba3.png

Both servers have the same exact coding. I have tried 3 servers in all and only one of them has worked, with the same code. I am not understanding why it’s not being accepted at all.