In OneNote on my Lenovo Flexx I don't have to do anything and the pen works fine. In OneNote I can press the button and it automatically becomes an eraser. With my Lenovo Tab P11 it doesn't work and I tried to pair the pen. The instructions say that you have to press the button for 7 seconds, then the LED starts flashing. But my pen does not do that. But the LED is white when it is charged. Is it defective?