I didn't see this until now https://forums.playdeadlock.com/threads/invite-family-share-users-in-family-share-beta-are-marked-as-already-joined-despite-not-receiving-an-invite-email.21583/
If your in a steam faimly and play the game from someone else's account and you are no longer able to be invited. Furthermore it puts the owner of the game in the invitable section but you get a error when inviting them.
