This keyboard is only compatible with Surface Pro X. The numbers in the image above are, have been listed below. 1 – Storage tray 2 – Surface Slim Pen 3 – Keyboard 4 – Touchpad.
How to Fix it When the Surface Slim Pen 2 is ... Only the Surface Laptop Studio, Surface Duo 2 Pen Cover, Surface Pro X ...
You can do this by placing the pen in the storage tray of any of the accessories that ships with the pen – Surface Pro X Signature Keyboard or the USB-C charging base – for 1 second.