Meghan Markle and Prince Harry risk being “left behind” by the likes of Prince William and Prince Charles, a royal expert has claimed.

The Sussexes have made frequent appearances on virtual calls recently, from urging Americans to vote in the upcoming election to a candid interview about Black History Month.

William, meanwhile, made history last week by launching the biggest and most lucrative environmental award ever in the Earthshot Prize.

He also appeared in a landmark ITV documentary charting his journey around the world to discover more environmentally friendly solutions to the world’s problems.

Russell Myers, the Daily Mirror’s Royal Editor, has now urged Harry and Meghan to “get out more” like William or risk becoming “a bit irrelevant”.

“They’ve got to be careful here,” he said on Mirror podcast Pod Save the Queen. “Sitting in an Ivory Tower and sounding off about things that are just coming into your head without people to advise you is not coming across well.

“And they’re fast becoming a bit irrelevant, especially when it comes to the Cambridges and Charles speaking about massive global issues.

“They’re being left behind a little bit.”

Harry and Meghan’s recent appearances have been met with controversy in some circles.

Royal biographer Angela Levin said the pair’s comments on voting could act as the “final straw” amid reports the stunt may have violated the pair’s Megxit agreement with Buckingham Palace.

In the video message, Prince Harry urged US citizens to "reject hate speech" and vote in the country's upcoming presidential election.

Meanwhile, equality campaigner Trevor Phillips labelled Harry a “1980s polytechnic lecturer” for his comments on the Black History Month.

But the pair have stepped back from their roles as senior royals, which, as many supporters have noted, allows them to be more open about their beliefs.