I have installed windows 10 via boot camp. Now when i start up with windows , i can move magic mouse 2 on the screen but scrolling with mouse not working. When i start up with Osx 10.11.4 magic mouse 2 does not have problem.
I would recommend updating the Bootcamp application and drivers through Windows by using Apple Software Update. It is likely an outdated driver being on your system which does not have the proper information to handle the newer Magic Mouse 2.
navigate to "C:\Program Files (x86)\Apple Software Update" and run the updates. You will be able to se the scroll feature.