Hey,
Trucky disabled the feature back in June, here's a copy of what they wrote on their Discord..
"Until further notice, the Online Friends feature and Friends list will be always empty / no friends online to avoid heavy load on Steam API calls as Steam is banning API keys for too many requests
It's highly possible this feature won't back for a long time."
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chaotic-control's post in Steam friends doesn't show up in Trucky was marked as the answer