The couple will also not hold any family meeting at their royal residence, Balmoral Castle, Palace sources told media, thereby refuting earlier reports of Prince Harry and his wife, US actress Meghan Markle, not being invited to the alleged event.
A source reportedly said it was "simply untrue" to claim that the royal family was "snubbing" Harry and Meghan.
The rumors appeared after a UK tabloid reported on Thursday that Prince Harry and his wife had not been invited to attend the event allegedly scheduled to be held in a narrow family circle at Balmoral Castle to mark the anniversary of Queen Elizabeth II's death.
In March 2021, Harry and Meghan gave a controversial interview to US talk show host Oprah Winfrey, in which they accused their royal relatives of indifference, putting pressure on them, and racism. Since then, the couple's relationship with the royal family has remained strained.
Queen Elizabeth II died on September 8 in Scotland aged 96. Her reign, lasting 70 years and 214 days, was the longest of any British monarch. She was buried in Westminster Abbey on September 19.