This article applies to:
When using an input device such as a pen/stylus for response input, it may be necessary to calibrate the device to ensure accurate response input. Calibration of an input device can be accomplished through the system input settings. If the input device appears to be unresponsive, attempt to replace the tip or battery for the input device.
For more information, view Microsoft's web page on Troubleshooting the Microsoft Surface Pen.