How to Pair a Bluetooth Device to Your Computer, Tablet, or Phone
EW3160 Not being able to pair my Bluetooth Keyboard in Windows 10. The OS is asking for a passcode, instead of generating a passcode which I should enter on my keyboard. – Ewent
Fix Bluetooth: Check the PIN and Try Connecting Again - Technipages
動画あり】【Windows10】Bluetoothペアリング方法(キーボード)
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How to Enable or Disable Require PIN for pairing when projecting to this PC in Windows 10?