The Microsoft Modern Keyboard with Fingerprint ID can lose bluetooth connection if the keyboard runs out of battery. To reconnect, follow the steps below. - Connect the keyboard via the mini-USB cable to the Surface dock. - Open the bluetooth settings. - Remove the bluetooth instance of the keyboard. - Turn the keyboard off with the switch in the upper right corner, then turn it on again. - Click the popup dialog in the bottom corner to pair (nothing obvious will happen). The keyboard should now be listed as a bluetooth connected device in the bluetooth settings. It may still say "Not Connected". Unplug the keyboard from the Surface Dock and confirm it now says "Connected". See this [help article](https://support.microsoft.com/en-us/windows/use-microsoft-modern-keyboard-with-fingerprint-id-2f2c3d74-8ccb-0662-dbe3-e1f5aaf53b35) for more.