Federation with lemmy.world is broken

https://fanaticus.social/u/fanaticus_admin, https://fanaticus.social/u/headie_sage

I'm unable to subscribe to https://fanaticus.social/c/hockey@lemmy.world from my account on fanaticus.social

I'm unable to subscribe to https://lemmy.world/c/hockey@fanaticus.social from my account on lemmy.world

You can see that https://lemmy.world/c/hockey is active, but https://fanaticus.social/c/hockey@lemmy.world shows no activity.