Not sure if anybody has a similar issue on Steam, but my clan has members who are "online" and also not in-game, despite also playing. We're a clan spread across geographically, and we all managed to play together on NA server on Battle.net. Now we're on Steam, and some of the regulars I'd want to raid with, I can't see online.
Is this how the server works in Steam? Will this mean some of my friends won't be able to join me play?