Just find random Microsoft executives off LinkedIn, figure out their work email, and cc them on the conversation. I would search for anyone in 'privacy' and related keywords. One of them will see your email, mysteriously escalate it internally, and it'll be done. I say this as someone who has done this sort of thing multiple times now. It's always easier for the company to comply with the crazy person who's willing to directly email executives.
If they don't initially respond, just keep cc'ing them and politely sending emails 'hello, I'm just looking to follow up on this so that I don't have to escalate'. I promise you that this works
If they don't initially respond, just keep cc'ing them and politely sending emails 'hello, I'm just looking to follow up on this so that I don't have to escalate'. I promise you that this works