AFAIK all requirements are met. King of England wants to take some dejure land from the Jomsviking war chief (who is also duke of Lothian and Man), but the send button stays grey.
Well thats the problem, the holy order is of your religion and is not an "expelled holy order".Yeah Norse king of England trying to declare on holy order
edit: actually I still have a save and it's a anglonorse reformed Germanic king of England trying to use dejure CB on reformed Germanic holy order. No cool down either