Another Reason
It seems clear that there is a large amount of tension between the two young couples. To make matters worse, it probably did not help that Harry was assigned to be the Youth Ambassador to the Commonwealth. The Queen decided to pick Harry instead of William for the role.
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Confirmation
Some people who are loyal and die-hard fans of the royal family choose to think that feuds between family members don’t actually happen and that it’s all just something thought up by the press. On one occasion, they were asked if they ever have disagreements. There was a long and awkward silence until William blurted out, “Oh yes.”