Even though lemmy.ca seems to be federated with fedia.io (another instance of KBin), it doesn't seem like we can find lemmy.ca communities on there.
I made a post earlier today on fedia to see if anyone had any idea, but haven't really gotten any conclusive answers.
Thanks for fixing the federation issues! I had been trying to subscribe to /c/hockey from Kbin for a while but I was never able to discover the community.
I can confirm that I was able to see it starting approximately an hour ago.