The Duke of Sussex will not meet the King this week, the Telegraph can reveal.
Prince Harry, 39, landed in London on Tuesday morning and had made no secret of his hopes to see his father during the visit.
But a spokesperson for the Duke said: “In response to the many inquiries and continued speculation on whether or not the Duke will meet with his father while in the UK this week, it unfortunately will not be possible due to His Majesty’s full programme.
“The Duke of course is understanding of his father’s diary of commitments and various other priorities and hopes to see him soon.”
Prince Harry is expected to spend the rest of Tuesday in meetings connected to the Invictus Games.
On Wednesday, he will attend a service of Thanksgiving marking the 10th anniversary of the Games at St Paul’s Cathedral, where he will give a reading.
Buckingham Palace has highlighted the King’s “busy” diary this week, which is said to leave little room for manoeuvre.
He has meetings on Wednesday morning, is expected to attend a Buckingham Palace garden party on Wednesday afternoon followed by his weekly audience with Rishi Sunak, the Prime Minister.
On Thursday, he has a public engagement outside of London. He is also continuing with his cancer treatment, which involves regular hospital appointments.
The Duke is expected to be in London for three days before flying to Nigeria, where he will be joined by his wife, Meghan, for a quasi-royal tour.
Although it was Invictus Games commitments that brought him back to the UK, he had fervently hoped the visit would also allow him to catch up with his father.
The Duke last saw the King in February, when he made a dash across the Atlantic to visit him in the wake of his cancer diagnosis and appeared buoyed by a 30-minute reunion at Clarence House.
But the meeting was far from plain sailing, with plans changed at the last minute and the Duke unable to travel to Sandringham with his father as he had hoped.
In an interview with a US breakfast show from Whistler, Canada, a few days later, he spoke about how sickness could bring families together.
“I love my family. And the fact that I was able to get on a plane and go and see [my father] and spend any time with him, I’m grateful for that,” he said.
The Duke declined to divulge any information regarding his father’s health, saying: “That stays between me and him.”
But he vowed he would visit him in the near future. “I’ve got other trips planned that would take me through the UK or back to the UK, so I’ll stop in and see my family as much as I can,” he added.
The fact that the two sides were unable to align their diaries will dash hopes that long-fractured relations are on the mend.
The Duke is keen to resume ties after a rocky few years that have seen him increasingly estranged from the Royal family due to a series of public disclosures and accusations.