We&#x27;re working on (by which I mean I am working on) the invitation support for clients.  The standard allows either, and we didn&#x27;t turn it on because it was buggy, then months of other things dragged us away.<p>It&#x27;s really looking pretty nice now - the tricky part is safely processing incoming invitations, which I&#x27;m trying out a couple of different architectures to see what is most robust.