Prince Harry and Meghan Markle face another huge hit to their popularity after becoming the focus of a brand new documentary.

The Duke and Duchess of Sus𝑠e𝑥, who quit life as senior royals four years ago, were the focal point of the new programme Harry – The Lost Prince, which aired on Germany’s ZDF network on Tuesday.

Produced by award-winning filmmaker Ulrike Grunewald, the show reportedly revealed insights into the couple’s lives in the US after they left the Royal Family in 2020, which includes reportedly hearing from a number of different people who know the couple.

According to The Mirror, this includes a veteran soldier who knew Harry and accuses him of “whinging” about his family.

Although the programme is unlikely to make headlines in America, one royal expert warned it will most likely be a major blow to the couple, who are already facing popularity problems both in the US and the UK.

Royal commentator Duncan Larcombe told The Mirror: “I think any documentary that continues the criticism of Harry and Meghan’s modus operandi is going to be damaging.

“It’s in Germany so it’s probably not going to make a big storm over in the US. But it’s still a major blow for a couple who have seen their popularity plummet like a stone falling in a well since they left the UK.”

Recent polling results by YouGov found the barely-seen royal Princess Alexandra is liked by more Britons than Meghan Markle.

The quarterly data compiled by polling agency YouGov showed the Duchess of Sus𝑠e𝑥 is now 17th on the list of the most popular Royal Family members based on the size of her fanbase. Harry was also ranked in the YouGov poll and was one place above Alexandra

The programme aired the same night as King Charles and Queen Camilla hosted their state banquet for the Amir of Qatar last night.

The banquet was attended by 150 guests, including Prince Harry’s old friend David Beckham, who he is no longer believed to have a close friendship with.

The Royal Family have not commented on the release of this new documentary, with one royal expert saying they are ignoring it for one key reason.

Former BBC royal correspondent Jennie Bond told OK!: “I don’t think anyone at the Palace will be very interested in the German documentary.

“The King and William and Catherine all have far too much on their minds to worry about another probe into Harry and Meghan‘s life.”

Prince Harry and Meghan Markle have not publicly commented on the documentary since it was aired last night.