Unable to search and join community in lemmy.ca instance

I'm trying to join https://lemmy.ca/c/[email protected] as a subscriber from my account in lemmy.fmhy.ml.

I've searched [email protected], that url above, https://lemmy.ca/c/fuckcars, and every variant I can think of - it never comes up in the search as a community I can actually join. I'm not sure what the problem is.

Is it this specific instance/community, is it me?