Font awesome - why aren't only two icons shown out of all?

Question

Fonts

Good time, 2 icons are not displayed: wifi and sitemap. All other norms, some miracles. I understand if all were not displayed, but only those I need work

Answer 1

First: It would be nice to provide code. Perhaps there is a typo in the class name.
Secondly: Font Awesome 5 has two versions Paid and Free. Perhaps you have installed the free version, but are trying to use the icons from the paid one. Check.