For the community to show up on an instance, it needs to have been viewed by at least one person from that instance. (You need to be logged in for this to count).
I went to lemmy.one/c/[email protected] with my alt on that instance. Now you should be able to see it from there, even if you aren’t logged in.
Also, I think for posts to be federated properly there needs to be at least one subscriber from the instance (just visiting isn’t enough). I’m not sure about that tho.
This whole visibility thing is a serious problem, even though everyone seems to want us to think of it as normal and acceptable. Doing anything on a small instance becomes a bad idea.
To get the community started you can put it on !newcommunities, sub.rehab if there’s a counterpart on reddit, and maybe advertise it in any relevant places. After you get just one subscriber from an instance everyone there will be able to see it in search and the all tab.
Yes. I have been preaching that since I first started using lemmy in June. Every time I bring it up my comment is downvoted to oblivion. The way it currently works is borderline abusive to new users of lemmy.