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."
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 Royal Family have not commented on the documentary (Image: Chris Jackson/Getty Images)
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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.