Princes William and Harry spoke separately to recipients of the award which honours the legacy of their mother Diana, Princess of Wales.
Winners of the legacy award from the UK met the Duke of Cambridge at Kensington Palace while the Duke of Sussex spoke to winners from across the world in a live video meeting.
Harry, wife Meghan Markle and their children, Archie and Lilibet, live in suburban Los Angeles, which is eight hours behind the UK.
A rift between the brothers has been well-publicised, with Harry telling Oprah Winfrey earlier this year there was "space" between him and his older brother.
The legacy award was introduced by The Diana Award in 2017 to celebrate the life of the princess on the 20th anniversary of her death.
An awards ceremony at Althorp House, hosted by Diana’s brother Earl Spencer, will take place on December 9.
The legacy awards are handed out every two years, with William and Harry presenting the inaugural ones at St James’s Palace in 2017.
This year’s recipients – chosen by an independent judging panel chaired by Earl Spencer – come from across the UK, Taiwan, Colombia, Germany, India, Indonesia, Saudi Arabia and the US.
Tessy Ojo, chief executive of The Diana Award, said: “The pandemic continues to disrupt lives and exacerbate social inequalities.
“But out of the darkness of Covid, young people are standing up to shape change in their communities across the world.
“Their compassion, determination and agency to make positive change today and in the years ahead is immense.
“They couldn’t be a more fitting tribute and lasting legacy to Diana, Princess of Wales and her belief that young people have the power to change the world.”
In other royal news, disgraced former US president Donald Trump has accused Meghan of "disrespecting" the Queen and the Royal Family.
He said: "I'm not a fan of hers. I wasn't from day one. I think Harry has been used horribly and I think someday he will regret it.
"I think Harry's been used and been used terribly. I think it's ruined his relationship with his family, and it hurts the Queen."
The Queen wanted to end a state banquet with Barack Obama because “she wanted to go to bed”, the UK’s former chancellor George Osborne has claimed.
The monarch reportedly told Mr Osborne during the state banquet in 2011 to ask the then-US president to leave because she was tired.