The video was captioned: "A sneak peek of the #ForcesForChange video for the September Issue of British Vogue. Her Royal Highness, The Duchess of Sussex is the first guest editor for British Vogue’s September Issue and for the last seven months has worked to create an issue of inclusivity and inspiration, focusing on what connects us rather than what divides us.
"Fifteen women were chosen for the cover including New Zealand Prime Minister Jacinda Ardern, who generously lent her time to support The Duchess in this important issue. The women first met last autumn during Their Royal Highness’ official tour of New Zealand.
"PM Ardern says: 'One change that I’ve noticed over the course of my career, is just how polarised the world is now. I do think there is a solution to that though, and that’s ultimately us coming back to the humanity that we all share.'
"Thank you PM Ardern for being an amazing force for change."
The caption also promised that there would be more updates during the week.
Among the other famous faces to grace the cover of Vogue is actress Yara Shahidi, model Adwoa Aboah, climate change campaigner Greta Thunberg, activist and actor Jane Fonda, LGBTQIA+ advocate and actor Laverne Cox.
There has been some backlash over Meghan's decision not to include the Queen.
Editor-in-chief Edward Enninful has said of Meghan's contribution to the magazine: "To have the country’s most influential beacon of change guest edit British Vogue at this time has been an honour, a pleasure and a wonderful surprise.
"As you will see from her selections throughout this magazine, she is also willing to wade into more complex and nuanced areas, whether they concern female empowerment, mental health, race or privilege.
"From the very beginning, we talked about the cover - whether she would be on it or not. In the end, she felt that it would be in some ways a “boastful” thing to do for this particular project. She wanted, instead, to focus on the women she admires.”