IMO this is far more Harry than Megan. I believe they have legitimate reasons to be frustrated. Whether they have reasons to be frustrated with the family, no idea. Watching clips of Harry blatantly pitching Megan to Bob Iger months ago makes me wonder if some family tension comes from possibly receiving a caution about soliciting and Harry getting a little butt hurt. It wouldn't be surprising that he's been slightly indulged in the aftermath of losing his mother, being the brother who won't become king, etc. and possibly has been given a bit of the kid glove treatment in regards to toeing the line and now is facing pushback about shouldering big boy responsibilities.
Wouldn't be surprised if there's a healthy dose of entitlement at work as well, particularly on his part. It's starting to look like he has developed some of his mother's poor choices regarding how to relate to the media, including the back and forth of, you love me, I'll talk to you; I hate you, go away. Notably his "friend" who has repeatedly gone on the record publicly making lots of "inflammatory" statements is a reporter, a reporter who both Harry and Megan have confirmed is a friend. He also doesn't come off well when he preaches how other people should behave, something that has not endeared his father to the public.
I had to go help my mother this morning and she was watching one of the morning programs. I heard a comment about their network of celebrity friends via Megan. I understand she was an actress, but I just don't think they're friends with Elton John through her "Hollywood" connections. I think quite possibly Megan has been a bit more towed around in Harry's wake than was recognized -- and yet has been the face of most of the backlash.