I have the Surface Studio 2 (GeForce 1070) and I updated the drivers from NVidia rather than the ones in the Microsoft MSI package.
Your drivers will be different, I assume you have the 960M chip. You have to use the DCH driver type and select the studio drivers.
This does not guarantee that Premier Pro will work, there is a chance the issue is with Adobe, not NVidia or Microsoft !
You should also check this download for the CUDA 9.2 toolkit