they have "torpedoed" any chance of the Queen and senior royals helping them create a new position.
Finding Freedom, serialised over the weekend in the Sunday Times, has laid bare family disputes with the monarchy and is believed to have ruined any hopes of returning to royal duties when Megxit is reviewed.
A royal household source said: "The door will always be open to them as much-loved members of the family.
"But it's hard to see how they can now salvage the new role they wanted as 'hybrid' royals, running commercial careers alongside royal duties from the US."
And another said: "The review period has not yet been discussed but it doesn't seem as if there is any way of going back now. Some very private family matters have now been aired in public, seemingly with their blessing. That will be hurtful."
Bombshell book claims include:
But others suggested "it was all to be expected", with the hopes within the family now that the couple "have got whatever they want to get off their chests".
The book, which is due for release next month, will chart the events leading up to the couple's departure from the UK.
The authors -journalists Scobie and Durand - have had access to more than 100 people and sources claim it will portray the Sussexes in a positive light.
ROYAL LAUNDRY AIRED
It tells how Meghan was driven to Harry's cottage in Kensington Palace for a cosy night in after he told a pal she was "ticking every box fast".
She had joked after a recent two-year relationship ended before her first visit to London, she'd be happy with "a nice English gentleman to flirt with".
Harry was left "in a trance" after meeting Meghan for their first date, a pal claimed in the book.
The pair were "in their own little world" for three hours over beers and martinis at London's Dean Street Townhouse, after being introduced by a friend.
The couple have never shared who it was who set them up on that first date, and within days of the meeting Meghan began to hint at the blossoming relationship.
She posted on Instagram a photo of a Love Hearts candy saying “Kiss Me” with the caption “Lovehearts in #London” - a possible message to Harry.
This weekend we told how Harry and Meghan were branded a pair of “whingers” over their long list of gripes in a bombshell biography.
The Sun Online has approached Buckingham Palace for comment.