A theatre spokeswoman declined to comment, while Kensington Palace would not confirm the patronage.
The Association of Commonwealth Universities (ACU) describes itself as the world's first and oldest global university network, which supports the development of higher education across the Commonwealth. Her Royal Highness feels she can use her position to focus attention on, and make a particular difference to these organisations and, more widely, the sectors they each represent.
"Over the a year ago, Her Royal Highness has held meetings and conducted private visits with each of these organisations", Kensington Palace said.
The organizations were naturally delighted to have Meghan's endorsement.
Rufus Norris, director of the National Theatre, said: "I would like to thank the Queen for Her Majesty's long and unwavering support and service to the National Theatre".
The former Suits star then helped the ladies in finding outfits for women attending their second dressing, and she also sat in on interview coaching and preparation.
The Duchess of Sussex will today visit one of the charities, Smart Works, which helps long term unemployed and vulnerable women regain the skills, confidence and tools to succeed at job interviews, return to employment and transform their lives. "The Duchess of Sussex announced as our new Royal Patron"'. "Mayhew works to improve the lives of dogs, cats and the people in our community, tackling the root cause of animal abandonment and neglect and supporting vulnerable people to stay with their companion pets".
Meghan and Harry reportedly began renting the Cotswold property before their wedding a year ago.
Two of the patronages Meghan now has formerly belonged to the Queen and have been handed over to the Duchess.
And now, over 12 hours later, Kensington Palace has revealed the news itself.