====== Missing pairing code when adding bluetooth device ======

Sometimes when pairing a bluetooth device (like a keyboard), a popup will ask us to introduce a pin code, but it is not shown. \\ 
To display it, go to Registry Editor and delete the entry (folder) from the following location: 
<code>  
Computer\HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Bluetooth\ExceptionDB\Addrs
</code>
Then try adding the keyboard again.