You need to inform your instance that such a community exists. Usually, it's enough to type the URL https://kbin.social/m/OriginalDocuments into the search bar while logged in on Reddthat.
I will verify it thoroughly tomorrow, and if there is any issue on the /kbin side, I will have some free time to fix it. I'm almost certain that it used to work correctly in the past.
Hi @maegul, actually you can track people you follow in the /sub feed at https://kbin.social/sub/microblog. It might seem a bit chaotic, with what looks like random posts, but in reality, each of them has a response from someone you follow (or an boost post/comment). But you're right, it's not perfect yet, and the presentation will be improved in the coming weeks/months to highlight specific comments from people you follow on front. I'll probably write about it in my devlog soon ;)
Not really. The official repository (with issue management) is located on Codeberg. GitHub serves as a mirror in case of any issues with the primary service.