Meghan Markle and Prince Harry Won't Attend Palace Reception: 'It's for Working Members of the Family'

Karwai Tang/WireImage Meghan Markle and Prince Harry

Meghan Markle and Prince Harry will not join other members of the royal family at a Buckingham Palace reception for world leaders traveling to London for Queen Elizabeth's funeral.

PEOPLE understands that while the Duke and Duchess of Sussex were initially invited to the event on Sunday, the palace now says the reception is "for working members of the royal family."

Hosted by King Charles and Queen Camilla, the reception will welcome heads of state and official overseas guests who have traveled to London for Queen Elizabeth's state funeral on Monday. About 2,000 people are expected to gather at Westminster Abbey for the event.

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BEN STANSALL/POOL/AFP via Getty Images Prince Harry and Meghan Markle

On Saturday evening, Prince Harry will join his seven cousins in standing vigil around Queen Elizabeth's coffin in Westminster Hall, where it has been lying in state and visited by thousands of mourners since Wednesday.

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Although it was announced earlier this week that only working members of the royal family who hold military rank would wear their service uniforms for the Queen's funerary events, Prince Harry — who served two tours in Afghanistan during his 10-year career in the British Army — will wear his military regalia for the vigil.

The update comes "at the King's request," according to a palace source, and the decision was made without Prince Harry requesting a change, PEOPLE has learned. The Duke of Sussex was prepared to wear whatever was asked, PEOPLE understands, and his focus is on honoring his grandmother.

Darren Fletcher - WPA Pool/Getty Prince Harry and Meghan Markle on Sept. 14

Prince Harry, who turned 38 on Thursday, and Meghan, 41, had traveled to Europe from their California home for a series of charity events when Queen Elizabeth died on September 8.

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On September 10, Meghan and Harry joined Prince William and Kate Middleton at Windsor Castle to view tributes to the late Queen and greet well-wishers. Prince William, who invited his brother and sister-in-law to join him and Kate, thought the outing "was an important show of unity at an incredibly difficult time for the family," a royal source tells PEOPLE.

Chris Jackson - WPA Pool/Getty Kate Middleton, Prince William, Prince Harry and Meghan Markle

The couple were at Buckingham Palace on Tuesday when Queen Elizabeth's coffin arrived from Scotland, and they joined members of the royal family on Wednesday for a service at Westminster Hall after Prince Harry joined his father, brother and other family members in a procession through London.