I use a Microsoft Surface Pro 3 and a Microsoft Surface Pro Pen. I know you can set pen pressure on Wacom Cintiq systems, but I can't seem to set any sort of setting on my computer. I draw on Photoshop CC and my pen pressure works perfectly well.
Animate is a Wintab based app and requires WinTab drivers to detect and work with Pen Pressure & Tilt. You can also refer to the Microsoft page Troubleshoot Microsoft Surface Pen for Surface Pro 3 and Surface 3 for more information. This information applies to Surface Pro 3, Surface 3, Surface Pro 4, Surface Book
Hey if this Wintab install works please post your success here as I've been waiting for a solution for Animate's lack of pressure sensitivity. I want to buy a Surface Book but it's pointless for me if Animate does not work.