Social Icons on Menu Not showing as expected

Hi

I followed the instructions on this page https://docs.generatepress.com/article/adding-icons-to-menu-items/

However when I go to https://fontawesome.com

it gives me this code for Facebook <i class="fab fa-facebook"></i> which will translate in a box inside the menu.
On this page you give a different code <i class="fa fa-home" aria-hidden="true"></i> and that works
I then tried youtube i got this from the site <i class="fab fa-youtube"></i> and made it like this <i class="fab fa-youtube" aria-hidden="true"></i> hoping it would work ...nothing

What should I use for youtube?

Regards

A