The Duke and Duchess of Sussex were able to meet the young Victorians behind several innovative and entrepreneurial endeavours at the reception in the ballroom.
They included Hunter Johnson, who has been recognised by the Queen's Young Leaders program for his efforts running The Man Cave, a preventative mental health program for teenage boys.
Marita Chen, the 2012 Young Australian of the Year, demonstrated the Teleport robot which has been designed to help kids keep up with school while in hospital and allow elderly people to socialise.
The royal couple was also introduced to the founders of Farmwall, which makes vertical, edible aquaponic farms designed to grow in cafes and restaurants.
Harry asked whether the miniature indoor farms could be set up in people's homes, while Meghan wanted to learn more about the nutrients the plants relied on to grow inside.
Meghan also received more gifts including small teddy bears.
The royal couple, who were escorted by Premier Daniel Andrews and his wife Catherine, also briefly met senior parliamentary figures including Opposition Leader Matthew Guy, Legislative Assembly Speaker Colin Brooks and Legislative Council President Bruce Atkinson.