How to make Font Awesome Icons solid when using Font Awesome 6 Pro

Question

I have the following pseudo-css rendering the correct Font-Awesome icons, but just not as solid icons:

content: "\f0dc";
font-family: 'Font Awesome 6 Pro';
padding-left: 5px;
font-weight: 900;

This renders the icons as "regular" => not as solid icons.

What do I need to do to have these icons render as solid icons?