SEGA and MS Working on PHANTASY STAR ONLINE 2

IGN has a statement from SEGA saying they are working with Microsoft to address issues plaguing the Windows launch of PHANTASY STAR ONLINE 2:
Yes, we are aware of some issues. Among them, we have investigated the issue of not being able to install. We've determined that this is caused by a number of different factors, some of which we believe cannot be addressed by our side alone. We are currently working with Microsoft about this issue in order to resolve it. We are preparing to put out a notice about measures to avoid some of the causes. We will continue to work with Microsoft to investigate and implement measures in order to resolve the situation.

We are also aware of the fact that the Windows10 version may run slower in the lobby. We have found a bug that seems to be the cause of this issue and will implement a fix in an update coming soon.