IMHO, while H seem to operate at a parallel line to reality, M seems to be more astute. I expect that by now at least M understands that the publication of Endgame was the endgame for H&M in terms of any hope of being working royals, so reconciliation does not equal M returning and cutting ribbons on a rainy Tuesday in Stoke.
H's social capital was solely established on his ability to access a Head of State at any time, due to the fact that the Head of State was his dear grandmother. His status was further reinforced by the fact that the next three Heads of State would be his father, his brother and his nephew...with the expectation that he would maintain access at will.
That social capital = dollars. The lucrative entertainment industry deals at Netflix and Spotify were predicated on the assumption that H would have ongoing access to the royal family even after moving to California. But once the bridges to the royal family were nuked via interviews, books, press releases and their Sussex Squad's relentless online attacks, H & M's social capital evaporated alongside their access to the royal family.
Even worse, as a previous poster rightly pointed out, association with the Sussexes decreased the chances of association with the royal family as whole and in particular future KW5 and future KG7...key centers of political gravity for the next seven to eight decades.
I can't see M being anything other than supportive of reconciliation since H has no way back. A more cordial relationship with the royal family represents 100% upside for H&M and their struggling "joy" rebrand.