How does this work on kbin at the moment?

My understanding is that, at least on Lemmy, you should be able to search for a full community name, wait a while, and have it show up and start federating. I’ve been searching for two communities (in the format name@instance.tld) on kbin since yesterday and it still shows no matches.

Both are small (<20 subscribers) and currently inactive (no new posts in a week). Do I need to wait until there is new content in them?