I am using a Logitech K810 bluetooth keyboard with Windows 10 on my MacBook Pro Retina 13" (late 2012). Is there a way to change display brightness with a non Apple keyboard?
Since you're using Windows I think you're reliant upon the Bootcamp drivers which probably need, if not a genuine Apple keyboard, then maybe at least a keyboard designed for Mac.
I wonder if you'd have better luck with the K811.