They said: “Harry wants to be there.
“It is already causing a headache and is going to be very awkward.
“Where will they be positioned if they turn up? What events can they attend?
“Will we put them on the Buckingham Palace balcony for the flypast?”
The momentous occasion will be marked with a RAF fly-past, watched by the Queen and other members of the Royal Family from the Buckingham Palace balcony.
In the past, Meghan and Harry have been among the royals stood on the balcony to watch the planes soar through the air.
But as the couple has stepped down as senior royals, it is not known whether they will be invited to stand alongside other members of the Firm – or take part in any of the other expected celebrations.
The Jubilee celebrations will take place from 2-5 June 2022.
It will be marked by 1,400 parading soldiers, 200 horses and a star-studded concert called Platinum Party at the Palace.
A Service of Thanksgiving will be held at St Paul’s Cathedral.
A special pageant will take place in the streets around Buckingham Palace on the Sunday, featuring over 5,000 people and combining street arts, theatre, music, circus, carnival and costume.
The celebrations will mark the first time any British monarch has reached 70 years on the throne.
The Queen is already the longest-reigning monarch, gaining that title in 2015.
She acceded to the throne on February 6, 1952 when she was 25 years old.