I'm new too and also have a Mastodon account, just tried my first post on Mastodon and was able to see it here, just be aware that mastodon post shows under microblog.
Haven't tested the other way posting here and checking on mastodon but I guess if you post as a micro blog it will show but something under magazines maybe not.
Also want to mention that at first it did not show up (granted was just a few seconds, a minute at most) but I search my mastodon account here in kbin and it showed there and after that it showed on microblog, I guess with the search a kind of forced the sync between kbin and mastodon.
Am I doing this right? (kbin.social)
Not sure if this is the right place to ask, but I’m new to this whole fediverse thing and I don’t know if it works like it seems to....