Prince Harry has pulled out of flying over for the Prince Philip memorial amid security concerns.
It comes amid the Duke of Sussex's legal case against the Home Office over his security arrangements in the UK.
Westminster Abbey is hosting a Service of Thanksgiving for the Duke of Edinburgh on March 29 to commemorate his relationship with the Abbey.
It is understood the 37-year-old royal plans to visit the Queen as soon as possible, but it is not clear when that will be.
The last time Prince Harry was in the UK was to unveil the statue of his late mother Princess Diana alongside his brother Prince William in July 2021.
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The Duke of Sussex had applied for a judicial review of a Home Office decision not to allow him to personally pay for police protection for himself and his family when they are in the UK, a legal representative has said.
He wants to bring his children to visit from the US, but he and his family are "unable to return to his home" because it is too dangerous, a legal representative previously said.
Prince Harry wants to fund the security himself instead of asking taxpayers to foot the bill.
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He was said to have been unhappy with how his security was dealt with in the summer when he returned to the UK for the unveiling of a statue of his mother.
When Harry arrived in April for the funeral of his grandfather Prince Philip, Harry was met on the tarmac at Heathrow Airport by Scotland Yard protection officers.
But when he came back again in July, it is thought that was not the case, and it is understood Harry's car was chased by photographers as he left.
Last month, the Queen tested positive for Covid but was well enough to meet Canadian Prime Minister Justin Trudeau at Windsor Castle on Monday.
Buckingham Palace said her son and heir Prince Charles would act for her in her place at next week's annual service for the Commonwealth of 54 nations which she heads.
Buckingham Palace said in a statement: "After discussing the arrangements with the Royal Household, the Queen has asked The Prince of Wales to represent Her Majesty at the Commonwealth Service at Westminster Abbey on Monday.
"The Queen will continue with other planned engagements, including in-person Audiences, in the week ahead."
It comes months before the Queen's Platinum Jubilee where it remains to be seen if the Duke and Duchess and Sussex will be coming for the celebrations.
There has been much doubt whether the Duke and Duchess of Sussex would return due to issues over security - having forgone some privileges on stepping down as working royals.
If they do, it would be the first time the Queen will meet the couple's second child Lilibet Diana Mountbatten-Windsor.
