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Prince Harry has already departed the United Kingdom after a meeting with King Charles III following his cancer diagnosis, Fox News Digital can confirm. 

The Duke of Sussex is already en route to the United States, leaving Heathrow Airport this morning, according to royal expert Hilary Fordwich. The estranged prince was reportedly not allowed to stay at any of the royal residences and did not have a reunion with his brother, Prince William.

Harry arrived in the UK to see his ailing father on Tuesday, meeting the monarch for a brief visit at his London home, Clarence House. Fordwich previously told Fox News Digital that although the younger prince wanted a reunion with his older brother, no meeting would materialize.

PRINCE HARRY VISITS KING CHARLES FOLLOWING CANCER DIAGNOSIS BUT 'NOT MEETING' WITH PRINCE WILLIAM: EXPERT

Prince Harry looks off camera in a white button down shirt and grey suit at the Invictus Games in Germany

Prince Harry has already left London after a brief visit with King Charles. (Chris Jackson/Getty Images for Invictus Games Dusseldorf 2023)

Instead, Prince William resumed royal duties on Wednesday, attending his first engagement since wife Kate Middleton was hospitalized for abdominal surgery and the King announced his cancer diagnosis.

The prince hosted an investiture ceremony at Windsor Castle, which acknowledged the exceptional achievements of individuals. There are six different Orders of Chivalry and two Orders of Merit that can be bestowed upon a person, at different levels. Recipients are made officers of the Most Excellent Order of the British Empire or officer of the Order of the British Empire.

KING CHARLES THRILLED PRINCE HARRY IS BACK AS ROYAL; URGED TO ‘BUILD BRIDGES’ WITH WILLIAM: EXPERT

Prince William in his navy uniform smiles across from Ellen White at Windsor Castle

Prince William returned to royal duties on Wednesday following wife Kate Middleton's hospitalization for abdominal surgery and father King Charles' cancer diagnosis. (Yui Mok/PA via AP)

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Recipients included former athletes, current educators and executives. The ceremony, which normally takes place at Buckingham Palace, was likely at Windsor Castle so that William could remain close to his wife, who is recovering at their home, Adelaide Cottage, per Fordwich. 

William is expected to attend a gala on Wednesday evening for the London Air Ambulance Service. "Therefore, we know Kate is well enough for him to leave her side and presumably there will be a nurse on hand if needed," Fordwich explained.

Ellen White in a light blue dress and navy hat holds her medal

Former footballer Ellen White was made a Member of the Order of the British Empire. (Andrew Matthews - WPA Pool/Getty Images)

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Prince William is expected to take on added responsibility while his wife recovers from her hospital stay and King Charles undergoes cancer treatments.

Princess Anne was also spotted performing royal duties on Wednesday, meeting with military personnel in Bicester, England.

Anne, Princess Royal in a red wool coat attends to royal duties, speaking with military personnel

Princess Anne visited the Defence Explosive Ordnance Disposal Training Regiment at St George's Barracks, in Bicester, England, on Wednesday, as responsibilities ramp up in the wake of King Charles' cancer diagnosis. (Chris Jackson/Pool Photo via AP)

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During a recent appearance on "The Story with Martha MacCallum," royal expert Neil Sean explained how he thinks the extended royal family will step up in this time of uncertainty. 

"The Princess of Wales, Catherine, is incapacitated back recovering herself," Sean said. "And then, of course, you have Prince William who is also on daddy duties … So now, we're going to have to see the Duke and Duchess of Edinburgh and, of course, the Princess Royal — but it does leave the royals very thin on the ground."

Prince William drives away from The London Clinic inset a photo of him close up

Prince William was photographed leaving The London Clinic on Jan. 18. (Getty Images)

On Jan. 17, the palace first announced that Middleton had been hospitalized. Upon recommendation from her medical team, the princess will likely not resume public duties until Easter in late March. 

Just days after the announcement, Prince William was photographed leaving the clinic after a visit with his wife.

King Charles in a navy suit waves to spectators as he leaves The London Clinic

King Charles left The London Clinic on Jan. 29 after undergoing a corrective procedure for a benign prostate enlargement. It was during this procedure that it was discovered he had cancer. (Max Mumby/Indigo/Getty Images)

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Hours after Middleton's hospital stay was shared, Buckingham Palace released that King Charles would be undergoing a "corrective procedure" for an enlarged prostate.

The king was admitted to The London Clinic, the same hospital as Middleton, on Jan. 26 and later released. On Feb. 5, the palace announced that during his hospital stay, "a separate issue of concern was noted" and later identified as cancer.

"His Majesty has today commenced a schedule of regular treatments, during which time he has been advised by doctors to postpone public-facing duties. Throughout this period, His Majesty will continue to undertake State business and official paperwork as usual," a press release said.