Can't find certain communities and users in search

I'm trying to search for otherkin@pawb.social and maia@crimew.gay so that I can follow them, but neither comes up when I use the searchbar. For the community, I know kbin.social is federated with pawb.social because other communities from there do come up in search. I've tried searching for both using name@domain, @name@domain, and full URLs. Nothing. What's going on?