The final straw, according to royal sources, was the sight of the incalcitrant former prince trotting around the Windsor estate, literally on his high horse.
Prince William, 43, is the patron of the Welsh Rugby Union, meanwhile Princess Catherine's team of choice is England, for whom she also serves as patron.
Less than three months before Prince Harry was due to wed Meghan Markle, the couple strode out with Prince William and Kate Middleton at the first Royal Foundation Forum in London.
How can the royals ever recover from the sordid disgrace the former Prince Andrew has brought upon them as a result of his association with Jeffrey Epstein?