Sorry but your provided link is not working (anymore?).
How do you have embed font awesome into joomla 4?
I've never used FontAwesome directly from a template (when required in a extension i've added it to the lib)
My tests on a blank J4 page with cassiopeia template (that should support FA) was also not working... BUT i was also not able to simply add an icon into a an article aswell so...
How do you have integrated FontAwesome?
the HTML got rendered so it has something to do with the integration of FA.
kind regards
Marco
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when using j3, I was able to use font awesome by simply putting this code
however the symbol seems to be there but just not shown :/ strange
Rate us on JED: https://extensions.joomla.org/profile/profile/details/379934
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sorry for trouble caused
https://fontawesome.com/v6/docs/web/setup/get-started