In the trailer, Harry consoles Meghan over her treatment by the media, saying, "I see you literally being hounded to death and I'm helpless to stop it."
"I am the person who is strong and gets things right. I can't lose you," Meghan responds.
And fans were left gobsmacked - some wondering if the trailer was actually a joke.
"Oh my goodness… I can't stop laughing. I thought this was a joke, then realized it is actually a movie…which made me laugh even more," one said.
The clip shows the pair recreating their recent tell-all interview with Oprah Winfrey, during which Meghan claimed that certain members of the royal family had had "conversations with Harry about how dark [their son Archie's] skin might be when he's born".
Actress Sydney Morton, who plays Meghan, previously called the experience of filming the movie a "wild ride" amid backlash over the casting choices.
The description for the film teases: "Harry & Meghan: Escaping the Palace reveals what really happened inside the palace that drove Harry and Meghan to leave everything behind in order to make a future for themselves and their son Archie."
Harry & Meghan: Escaping The Palace does not have a release date yet.