Federation between kbin and Calckey

I wanted to share some of my kbin articles by boosting them from my Calckey account, but I can't see them from Calckey. If I search for the kbin post from Calckey, either by using the "copy URL" or the "copy URL for the fediverse" link, nothing is found.

On the other hand, if I search for the post from a Mastodon account, it works, I can see the kbin post and boost it.

Any idea if the problem is on the kbin side or on the Calckey side?