“Respected journalist Quentin Letts tweeted: “Friend of an acquaintance was about to go riding with HMQ. Was given v firm advice. ‘Talk about anything except one subject.’ Brexit? ‘No. The Sussexes.’”:
https://www.thesun.co.uk/news/9934533/queen-guests-talk-meghan-harry/
Yeah, right. So presumably it would have been OK to discuss Brexit or even the Prince Andrew/Epstein scandal with HMQ?
A quick look at his Wikipedia entry reveals that not everyone regards Quentin Letts as "respected."
Besides, if her HM were unhappy with the Sussexes wouldn't she let them know?
Smells like fake news to me.