According to royal expert Rebecca English, when Charles turned 75 last year, Harry rang up his dad, but the fact that the conversation and details of their call hit the news was a sore spot for the king. English explained that Charles was happy to call his son this year, but is still being careful with everything between himself and Harry.

According to royal commentators, it still bothers Prince Harry that Queen Elizabeth wouldn't allow him to have "his cake and eat it too."

Prince Harry has announced that he is returning to the United Kingdom before the end of September. King Charles sent his youngest son a birthday wish on his 40th birthday, which could be seen as an olive branch to Prince Harry.

Prince Harry's relationship with father King Charles leaves much to be desired as things are, but one royal expert believes there's a potential way out of their standstill. Commenting on the possibility of a rapprochement on the Duke of Sussex' imminent visit to his home country,

One old friend of Harry’s, asked about the likelihood of an invitation to meet with his father or brother, said: “Harry is not expecting the call-up from the king or William.”

King Charles III and Prince William's birthday wishes to Prince Harry appear friendly but mask deeper tensions.

Prince Harry could reunite with King Charles for the first time in months, as the duke heads to London. The Duke of Sussex will fly to London to present an award and deliver a speech at the WellChild Awards,