The Duke of Sussex reportedly called his dad on his 75th birthday last year, however the details of this call did not remain private.

Prince Harry is said to have “destroyed” the remaining trust with his father, King Charles, following a call on the monarch’s 75th birthday last year.
Although the two have reportedly grown apart since Harry stepped down as a senior royal in 2020, they have continued to communicate despite the Duke’s numerous public criticisms of the Royal Family.
The prince, now 40, chose to reveal several private and personal conversations involving members of the Firm during a 2021 interview with Oprah Winfrey. This was followed by the Netflix docuseries Harry and Meghan and his controversial memoir, Spare.
While Harry’s decision to publicly discuss his royal life and make serious allegations against the family has strained his relationship with his brother, Prince William—whom he is believed to no longer speak to—it seems King Charles has not completely cut ties with his youngest son.
On the King’s birthday last year, Prince Harry called from his Montecito mansion in California, along with his two children, Prince Archie, five, and Princess Lilibet, three.

During the call, Harry reportedly filmed a heartwarming video of the children singing “Happy Birthday” to their grandfather, with these details later being leaked to the media. The Sussex camp faced accusations of leaking information about the private conversation.