While officials remain tight-lipped on the content of his phone call, the fact the Duke called Mr Gates as patron of the Royal Foundation suggest their meeting had to do with a charitable project, possibly linked to the current coronavirus pandemic.
The entry, dated May 21, read: "His Royal Highness, Joint Patron, the Royal Foundation of The Duke and Duchess of Cambridge, this evening held a Meeting with Mr William Gates (Co-Chairman and Trustee of the Bill and Melinda Gates Foundation) via telephone."
Mr Gates is at the forefront of funding efforts to find a vaccine for COVID-19.
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