If a PIN does not display, enter 0000, a commonly used default PIN for many Bluetooth devices. Before a companion device can be used, a PIN needs to be set up on Windows 10 desktop device. The fixer Windows Update common problems - and the fixes The Windows Update is here, but if it's causing problems you can use this guide to troubleshoot and fix them all. The keyboard was originally connected without issues. Windows 10 usually has several updates that can cause the Bluetooth connection to fail, as it would with WiFi. ” If Issues addressed in this tutorial:check the pin and try connecting agai Delete the corresponding folder.