I believe that this is the article that mentions it, note that this article is also the first I believe to allude that Sony was shutting down Japan studio by not renewing contracts.
https://www.bloomberg.com/news/articles/2020-11-07/microsoft-sets-sights-on-sony-s-home-turf-in-game-console-clash?leadSource=uverify%20wall
MS have tried but is finding it hard to get partnerships and exclusives in Japan to try to compete there, this is why I’m in the camp that they should just buy Platinum Games since they are basically asking to get bought out MS need to swallow their pride so they can at least start somewhere.