Yes, the premium dashboard purchased from Google does not work on Microsoft or Apple products. This is strictly forbidden on each store rules (cross selling). If we would give you free product on Windows when you have paid it to Google, Microsoft would kick us out of their store, and vice versa. Its like buying a game for Playstation will not give you free version for XBox. They all want their share of the pie. I hope you understand that this is out of our hands.
Another option is My RealDash (my.realdash.net) subscription which opens all premium content on all platforms (Android, Windows, Linux, iOS, OSX).