kbin.social shows up in the instances list (https://discuss.tchncs.de/instances), but I’m having trouble with !nfl@kbin.social. I couldn’t get it to show up in search until I searched for the full URL (https://kbin.social/m/nfl). Once it did, I can join, but there’s no content. See here: https://discuss.tchncs.de/c/NFL@kbin.social
Edit: actually, one post has now shown up, but not the rest.
When I joined the !knitting@lemmy.world I was definitely the first person to join. E.g. I got an error going to https://discuss.tchncs.de/c/knitting@lemmy.world until I did the search. But once I did the search it worked, I could follow I had immediate content etc.