I believe Kbin isn't federating properly at the moment because everything is on fire over there due to growth. But once that's sorted out, then you'll be able to do this.
Just tried it myself on my instance. Seems to be an issue with certain magazines. Did a search for the full URL of https://kbin.social/m/gaming with all settings on "All" and it worked. https://kbin.social/m/tech did not though. Not sure why.
Probably growing pains. The federation is obviously happening between those servers but the exchange of data only happens if you actually if a user subscribes. But probably Kbin has some servers issues.
I've been seeing server errors at Kbin, every time I tried to look it at.