Harry received a standing ovation from the London crowd, which he addressed from California. Those in attendance included Mr Morgan, the former Good Morning Britain co-host, who has emerged as a fierce critic of the Sussexes.

The host welcomed Harry with the words: “We love him, yes, we miss him.

“Please welcome, live from California, Prince Harry, The Duke of Sussex.”

Harry delivered an address hitting out at coronavirus disinformation, and urging rich countries to share vaccines with the developing world.

Sussex fans took to social media to praise Harry’s speech, and mock Piers Morgan for being forced to listen.

One Twitter fan account, which had a photo of Meghan as its profile picture, tweeted: “The introduction to Harry’s speech was so cute!

“He got a standing ovation and to make it sweeter Piers Morgan was in the crowd.”

She ended the tweet with an emoji denoting “face with tears of joy”.

Another Twitter user wrote: “Piers being there is just icing on the cake.”

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The former Good Morning Britain presenter also came under fire from Dr Shola Mos-Shogbamimu, a lawyer and political activist, over his attitude towards Prince Philip.

She shared an article Mr Morgan wrote in 2019, after Philip was involved in a car crash, and compared it to one of his recent tweets.

The 2019 article was titled: “Piers Morgan: It’s time the Queen gave her rude, stubborn, insensitive, arrogant and dangerous Duke of Hazard his driving marching orders.”

Dr Mos-Shogbamimu tweeted: “Hypocrisy of Piers Morgan knows no bounds. He branded 97yr Prince Phillip ‘rudest human being ever met’.

“Demanded Queen gives him marching orders in 2019. But y’all about his Freedom of Speech yes?”

On Wednesday ITV was cleared by media regulator Ofcom, over comments Mr Morgan made about the Sussexes.

Following their incendiary interview with Oprah Winfrey in March, the Good Morning Britain presenter said he “didn’t believe a word” Meghan said.

Ofcom ruled restricting his opinions would be a “chilling restriction” on free speech.

Mr Morgan said he was “delighted” with the decision.

He added the regulator had “emphatically endorsed my right to not believe what the Duke and Duchess of Sussex were saying”.