The Duke and Duchess of Cambridge were seen speaking with a family who had been helped by the charity.
The Instagram post continued: “During their conversation, The Duke and Duchess heard more about the circumstances that led Jack, their 12-year-old son, to reach out to Shout and the life-saving impact that his text conversation had.
“Read more about Jack’s story via the link in our bio. #Shout85258 is the UK’s first 24/7 text messaging support service, offering a free and confidential platform for conversations around mental health to ensure no-one has to face their problems alone.
“The service was researched and developed with The Royal Foundation as a legacy of the Heads Together campaign and was set up with a donation from The Royal Foundation.”
The Duchess of Cambridge wore a long sleeved black and white polka dot shirt during the appearance.
She gave the look a casual feel by leaving it unbuttoned at the top.
The mother-of-three showed off her thrifty side and chose to wear the Equipment shirt she has been seen in before.
The versitle look has been seen on the royal as far back as September 2019.
The gold hoops appeared to be a pair she has worn on several occasions before which are believed have cost just £5, from Accessorize.
Kate swept her long brown hair off her face and pulled it into a half-up half-down do.
She chose to wear a natural looking make-up look with nude lipgloss and a slick of bronzer.
Kate and Prince William appeared to film the video at home and were sat in front on a number of personal family photos.
The royal line of succession – who outranks who?
The line of succession to the British throne dictates the order in which each member of the Royal Family would ascend to the throne.
It is also seen as a ranking of importance with the head of the line, the Queen, taking the place of ruler.
Older children come before younger children. Traditionally boys came before girls, but this law was changed on 26 March 2015 before the birth of Prince William’s first child.
Incredibly, Catholics are still excluded from the line of succession, as are children born outside of wedlock.
The royals, who usually stick to a strict protocol when appearing in public, often arrive at events in ascending order of importance, with the most important royal arriving last.
Prince Charles, 72, is currently first-in-line to the British throne, followed by Prince William, 38, his oldest son.
Then comes Prince William’s children, George, seven, Charlotte, five, and Louis, two, and they are followed by Prince Harry, 36. Prince Harry is succeeded by his son Archie Harrison, born in May 2019.