I have been trying to find the connection between the Nelson Mandala Foundation and Archewell.
www.royal.uk/duke-and-duchess-sussex-visit-nelson-mandela-centenary-exhibition
Looks like Harry has visited in 2015, and in 2008. He gave a speech during the event in 2015, long before this documentary was in the works and Meghan was around. It appears, that Harry and then Harry & Meghan have a previously established relationship with the Nelson Mandela Foundation.
I don't see any connection with H & M to Blackwell & Ruth, but I did a quick search. There may be something I have missed.
What I am not finding is something untoward. Just a standard business deal. Is that because H & M were interested in the project and reached out? Maybe. Was it because the NMF wanted them to present? Maybe. No one knows.
I do find it rather, odd I guess, that so many people complain that the royals live off tax payer money. Then when they do find jobs, those same people seem to complain about that.
They are working, making money and not slagging off the RF in this series. Instead they are presenting a group of highly inspirational people with 2 very respected foundations/companies with the goal of inspiring new leaders for our future.