It is understood Prince Harry will not be joined by his wife, the Duchess of Sussex, and their two children when he visits the UK next week.
Meghan, Archie and Lilibet will not travel to London as originally planned after it was confirmed the family would not be provided with taxpayer-funded police protection.
It is still possible they will join Prince Harry later this week when the five-day trip moves to Birmingham to promote the Invictus Games.
It is unclear whether the meeting between King Charles and his two grandchildren, aged seven and five, whom he has not seen in person for four years, will take place as per the revised schedule.
London was thought to be the most likely location for a family reunion after the Duke and Duchess of Sussex accepted an offer to stay at the royal residence with their two children.
The king has a number of public events planned for next week. Buckingham Palace does not comment on private family matters.
The change means Meghan will not join her husband when visiting the Royal Chelsea Hospital for meetings related to the Invictus Games on Wednesday. Prince Harry will now attend alone.
Discussions are ongoing regarding security elements for the later part of the visit, but as far as is known, no final decision has yet been made.
It was reported that the last part of the trip will include a visit to Althorp in Northampton, the family estate of Prince Harry’s mother, Diana, Princess of Wales.
It is believed that Prince Harry planned to take his wife and children to his mother’s private grave.
The visit will move from London to Birmingham on Thursday when Prince Harry visits the city’s children’s hospital to support the work of the charity WellChild, which he has continued to support since moving to the United States.
If Meghan does come to the UK later this week, she is due to join her husband at the NEC Birmingham to mark the year-long countdown to the Invictus Games venue.
The decision to scrap the London leg of the visit followed uncertainty over whether the trip would go ahead.
Sources close to the Duke and Duchess of Sussex said the move was prompted by concerns from Prince Harry’s personal security team, which spent several days reviewing the arrangements.
They also cite a lack of up-to-date assessment by the Royal and VIP Executive Committee’s (Ravec) Risk Management Council, which makes decisions about the security of senior members of the royal family and other senior UK government officials.
A Home Office spokesman said: “It is our long-standing policy not to provide details of security arrangements as this may compromise their integrity and impact on the safety of individuals.”
Prince Harry’s long-running dispute with the UK government over security dates back to his decision to step back from his role as a senior member of the royal family in 2020 and move to the US with his family.
The prince disputed Ravek’s decision that because he would be an infrequent visitor to the UK, his safety would be assessed on a case-by-case basis.
He has previously said he would not bring his family into the country without enhanced security measures, telling the BBC in 2025 that he “cannot see a world in which I would bring my wife and children back to the UK at this time.”
The last time Prince Harry and Meghan were together in the UK was in 2022, during the funeral of Queen Elizabeth II.
He has since traveled the country alone and met his father during a trip last September.