I prefer “Your Majesty”.
LOL, had a gay boss back in the early 2000s a vendor we had to work with had a mixed up person that thought he was a woman, the boss called three of us in and said we had to now call him - her, small argument: he needs help not encouragement, etc., Loretta, an african american that we all loved but had a mouth, said, I want to be called “her royal highness” the boss laughed and she looked at him and said - whats funny?