Meghan, Duchess of Sussex - Wikipedia
They both do a lot of good works but Duchess Meghan should have, at least, expected a lot of push back from the more conservative members of the Royal Family. Good to see that Prince Harry has her back though. More power to them.
Prince Harry, Duke of Sussex - Wikipedia
There is a huge interest in the British Royalty in the US. A lot of this is about ratings on TV for commercials.
As to foreign and domestic UK policies, the Royals have little say in any of that as far as I know. That is in the hands of Parliament and the rest of the UK government.