The server component was removed and replaced by some client proxy that redirects all messages directed to the former focus component to the focus user. The changelog does not mention the removal of the server component in any way.
When using the focus user directly with the full resource, which seems to be the user id/local part by default, ie. firstname.lastname@example.org/focus, communication works without the proxy. Is there any special reason why you avoided this? Do we have to expect troubles from not using the client proxy?