King Charles swore the Sussexes to secrecy over their Highgrove reunion, and sources say not even Prince William and Kate Middleton were informed.
https://www.foxnews.com/entertainment/king-charles-kept-prince-william-kate-middleton-dark-secret-harry-meghan-reunion-report
https://www.foxnews.com/entertainment/king-charles-kept-prince-william-kate-middleton-dark-secret-harry-meghan-reunion-report