Hello,
tried following a Lemmy community (e.g. test@feddit.it) both on my own instance (citiverse.it, v4.14.2) and here on community.nodebb.org, from the category page (/category/test@feddit.it). In both cases the follow seems to go through, but new posts never show up afterwards.
Is this a known issue, or should I dig further and post more details?
You're in luck, I've learned a thing or two about this.
NodeBB categories do not follow activitypub group actors. Form category actors are not community groups and so aren't really compatible. NodeBB follows account style actors and remove group posts are not imported the same as local posts.
In order to get group support working on a wide variety of platforms, the software needs to have a wide variety of dialects that it knows how to deal with.