I didn’t want to eta, so addition: what is being federated right now is readability and participation - with your kbin account you can absolutely interact with other fedi posts. But on the client-side options for a cross-platform one that can also be useable with a threadi login is still unavailable.
@revampeduser assuming you’ve subscribed so that the community is now regularly fetched from/pushed to kbin.social, then it’s likely a momentary hiccup with the federation which can be instance-specific