<xf:fa icon="fa-youtube-play" /> doesn't work (font awesome footer YouTube icon like the rss icon)

[Stuart Wright]

So I want to add a small link to our YouTube channel in the footer like the RSS link.
I copied it, but it doesn't work. No icon appears.
What do I need to do, please?
<xf:fa icon="fa-youtube-play" /> doesn't work (font awesome footer YouTube icon like the rss icon)

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