How do I search for certain Lemmy communities on Kbin?

I've been trying to join https://lemmy.world/c/climbing@lemmy.ml from kbin, but it's not coming up on the magazine search. If I search for that or !climbing@lemmy.ml, it just says "empty".

Other Lemmy communities do show up, though. If I search for "NBA", then nba@lemmy.world and nba@lemmy.ml both come up.