The source was quoted by E!
"Harry is getting regular updates and is aware of everything that is happening", the insider added.
"He has bravely spoken out in the past about loss and grief, and the enormous impact it has had on him. Sadly, some people are not just seeing this as a drive for truth, but also trying to use this as an opportunity to drive a wedge between the brothers".
According to the terms agreed upon by the BBC and investigators, the probe will consider to what extent the actions of Bashir influenced Princess Diana's decision to give the interview and what knowledge the broadcaster had of those actions at the time. However, Prince Harry was criticized by tabloids for not joining Prince William in publicly commenting on the matter and was accused of failing to protect his late mother's legacy.
The BBC has promised to "get to the truth" about the events surrounding the Panorama interview with Princess Diana.
The accusations emerged online after the testimony of Panorama graphic designer Matt Wiessler in ITV documentary "The Diana Interview: Revenge of a Princess".
This month, Diana's brother Charles Spencer said the BBC had failed to apologise for what he said were forged documents and "other deceit" which led him to introduce Diana to Bashir.
It will also examine what knowledge the BBC had in 1995 and 1996 of "mocked up bank statements purporting to show payments to a former employee of Earl Spencer (and) the purported payments to members of the Royal Households", the corporation said.
On Friday, Nov. 20, Spencer wrote on Twitter, "As I've told the BBC this evening, I'm not at all satisfied with the parameters they've set around their enquiry into the @BBCPanorama interview with Diana of 25 years ago tonight".
He added that he is doing this for Diana, telling ITV reporter Chris Ship, "I feel it's my duty to stand up for her when I can". She left me for instance as guardian of her sons etc, so I feel there was a trust passed on.
The BBC said Bashir, who is now its religion editor, is currently signed off from work, recovering from quadruple heart bypass surgery with significant complications from having contracted Covid-19 earlier in the year.
Those who knew Adeane, who died in 2015 aged 75, after serving as private secretary and treasurer to the Prince of Wales between 1979 and 1985, said the Netflix series was guilty of repeating cliches and inaccuracies about the way Princess Diana was treated in Royal circles.