Nevermind what I said, the problem here are the new changes in the .db file of osu!.
Yes, MSN integration is enabled. That's why I'm super confused! I never had any problems when I used it before
I'd recommend switching to osu!StreamCompanion if you don't want to wait for the osu!Post update.
(Baiscally the same tool with additional functions and fully included osu!Post support.)
I will update osu!Post itself