Prince Harry and Meghan Markle visited the UK for the Queen's Platinum Jubilee last weekend, flying over with their children and reuniting with members of the royal family for the celebrations.
However, an expert has claimed that instead of "mending fences" the couple ran into a "brick wall" with some senior royals - as they will have wondered if "anything they say may end up as a chapter in Harry’s memoir, or on a future podcast".
Author Duncan Larcombe, known for his work Prince Harry : The Inside Story, has told how he believes the couple is now facing a real test that could impact their future with the family.
Writing for Closer Magazine, Larcombe said that Harry and Meghan are at risk of being "cut off" if they leak any private moments from the Jubilee, leaving them in a "last-chance saloon".
He told the publication: "The test really begins now for Harry and Meghan. They have come to the UK and to the Jubilee and really cemented themselves as royals again - which is great for their brand and something that Spotify, Netflix and Penguin will be eating up.
"But everything now depends on their behaviour moving forward. Clearly, an olive branch has been extended by the Royal Family here. But Harry and Meghan would ruin that if any private information about this weekend was spoken about to the press or revealed in a book.
"It’s last-chance saloon for them now. If anything from the weekend leaked, I imagine they will be totally cut off and that’ll be it."
Larcombe added that while this could be seen as "dangerous ground" for Harry and Meghan to be on, it's also an opportunity for them to take "a huge step in the right direction" and "prove they can be trusted".
Harry and Meghan kept a low profile over the Jubilee period, only attending one event publicly - the Queen's Thanksgiving Service at St Paul's Cathedral.
The couple were seated on opposite sides from The Duke and Duchess of Cambridge during the service and a fellow royal expert has claimed the "reality" of Prince Harry's new life must have sunk in at this point.
Apart from a quick glimpse at Trooping The Colour on Thursday, they were not seen at any other royal events before heading off back to California on Sunday.
However, before leaving, the couple are thought to have introduced their daughter Lilibet to the Queen over the weekend and they held a first birthday party for the tot at Frogmore Cottage on Saturday.
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