Mainly about blusky.

I've noticed some people I follow on Facebook/twitter/youtube/tiktok migrating to bsky.social and my understanding was that misskey/sharkey is supposed to be able to federated with bsky and Mastodon, but several bsky accounts I've not been able to find from blåhaj sharkey. I'm wondering if it's been defederated or maybe they don't federate as well as I thought? Any assistance or advice is much appreciated!