"There were no raised voices, no arguments ... but the King was cold and brief rather than open to any proper dialogue," author Omid Scobie revealed in his new book, Endgame.
"Encouraged by a close friend, the Duke of Sussex reached out to Charles by phone to try to discuss some of the unresolved issues between them. It was an awkward conversation, but he knew if he didn't make those first steps, there would never be any progress," Scobie added.
The author further revealed that there has been "no significant resolution or outcome" since the monarch first spoke with his son about the book, and it was "once again [a] wasted opportunity [for the King] to take the upper hand and let bygones be bygones for the sake of family harmony."
Of all the senior royals criticized in the tome, royal analysts have pointed out that Charles III gets off the easiest when it comes to Harry's pointed attacks. He wrote how he found his dad to be "cold" and "detached" emotionally when he told Prince William and himself about Diana, Princess of Wales's death in 1997. But it was Harry's merciless insights into his stepmother, Queen Camilla, that are claimed to have angered the sovereign.
Despite His Majesty's frustrations, Scobie insists that those within the inner circle of the royal family seem to think that the King should consistently try and resolve the rift between the Crown and the Sussex duo.
"It's complex, but there's increasing frustration from some of the wider circle of family members that Charles won't just fix things for the sake of everyone," Scobie stated when quoting a royal insider. "The institution needs it. Just three months after the publication of Spare, the royal family's approval rating fell to its lowest level in years."
Some analysts point out how this is a weak assumption in light of the recent leaking of details of Charles III's private phone call with Harry and Meghan Markle. The King spoke with the pair on his 75th birthday on November 14, which also included his receiving a video of his estranged grandchildren, Prince Archie and Princess Lilibet Diana, singing "Happy Birthday" to him.
It was considered a major breach of royal and diplomatic protocol that a supposed private call the British head of state made would be talked about openly in the world's media.
Newsweek reported on excerpts from Endgame.