Help: I'm trying to subscribe to lemmy.ml communities on sh.itjust.works and it doesn't work.

I'm trying to subscribe to lemmy.ml communities on sh.itjust.works.

For example, if I search for yuzu on sh.itjust.works, it doesn't give me anything, even though my filter is in all and not local. If I do the same search on lemmy.ml it gives me the Switch yuzu emulator (https://lemmy.ml/c/yuzu). I don't understand, it seems to me that since lemmy is federated, you can subscribe to any instance and have access to all the content, no maybe I'm wrong, but I find it strange.

(and it's not just yuzu it's several other communities.)

Thanks for your help.