Why would foreign leaders recognize the existence of the Moot when all they achieve by that is promoting the union of possibly hostile realms. Only when that union becomes clear through actions aimed against those foreign powers will they have a reason to recognize it, and even then they will find it highly preferable to negotiate with the Moot's members separately.
So if you want the Moot to be recognized around the continent as a supra-national body, promote it by actions, not by words. This united stance (afaik) in dealing with the Zuma is a good start, but still the overwhelming majority of the nobles of Dwilight don't really care about the Zuma and just see those realms that do care band together against a common enemy. Nothing too surprising or out of the ordinary.
Only when other realms notice that they can't get through to barca, terran or d'hara without going through the Moot will they start caring about their relations with that guild. Until then it's just a means of communication between allies in our eyes. Like the Church is for SA and the Halls of Luria are for the Luria's. Nothing more, nothing less.
