Meghan guest-edited the September edition of the magazine, titled "Forces for Change", which featured 15 female figures including student climate activist Greta Thunberg, New Zealand Prime Minister Jacinda Ardern, actresses Salma Hayek Pinault and Jameela Jamil, boxer Ramla Ali and author Chimamanda Ngozi Adichie.
It is reported that Meghan's guest-edited issue became the United Kingdom fashion magazine's fastest-selling in its history and its top seller of the past decade.
On Thursday, the magazine shared an intimate behind-the-scenes video of a conversation between the Duchess of Sussex and Editor-in-Chief Edward Enninful. "I can't wait to see what 2020 has in store..."
"I was like, 'Lovely to meet you, Duchess, '" Enninful recalled in the video.
In the footage recorded in August 2019, Meghan and Mr Enninful reveal how the pair came together to work on the publication and the charity Smart Works. "Then you were like, 'Call me Meghan!'" Which caused the two to laugh.
Meghan said: "From January to now, how much we've been working on this and for me to just say, yes, you would help me on Smart Works - incredible".
"I didn't know if anyone had ever done it before", the royal mom said.
He adds, "You were so thorough from beginning to end". Edward sweetly responded: "You wanted to focus on women who are changing the world, women who are doing incredible things, which really is in line with what we do at British Vogue".
"Let's call some people", Enninful proceeded to say, before picking up his phone and calling the 15 women who ended up on the cover of the coveted September issue, most of whom were starstruck that the Duchess of Sussex was present to speak with them on the phone as well.
Fonda, the last caller heard in the video, praises Markle for using her "amazing platform and strong voice".
"From January to now, how much we've been working on this, and to just say yes, you'd help me on Smart Works - awesome. You're a true force for change".
A second said: "Love this, love her so much".