Blaming MS Windows store outright is just scapegoating. The store has past/present issues, yes. But there is a reason Tweaker came into existence in the first place....the PSO2 launcher had issues in JP. Sega shares a larger portion of the blame here. Even if that's not true, there has been absolutely no updates or communication from the NA team on how this problem is getting resolved.
Luckily for them, a third party software has saved the NA launch for Sega....for now.