Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !metal@lemmy.world
That's because you're on Mbin, which further complicates Lemmy's community linking process by making community links not always behave the same even though they look the same. This is something I really wish could be more properly unified across *bin and Lemmy.