Group Channels
Just a heads up: channels within a group don't initially show up. You basically have to scroll down to the channel section, and copy-paste a link into search so that Webfinger pulls it in.
Might be worthwhile to federate those over after successfully joining a group across instances. But for now, anyone that's missing these can manually pull them in.
Also, it looks like this post isn't visible locally within the group, or under this channel tag?
But it seems to have federated.