For some reason Reach has an issue working with a controller over steam link where the left thumb stick causes the mouse cursor to populate and move around on the screen randomly. In game the hints for controls switch from keyboard to controller back and forth as well (only with left thumb stick). Using Xbox one controller profile. Controller and Steamlink work fine with all other games. Controller will work fine with MCC when directly connected, just not when Steamlink is used with a controller.
Raspi3, steamlink, and 8bitdo xinput.