You do not need to configure a passkey when pairing a mouse to a computer. However, you must always configure a passkey when pairing a keyboard or number pad to a computer. The way that you specify a passkey depends on the Bluetooth program on your computer. If your Bluetooth program gives you a choice about how to create the passkey, let the program create one for you rather than creating your own or not using a passkey. When you type the passkey, you will not see feedback on the screen. After typing the passkey, you must press Enter on the keyboard or number pad to complete the pairing.
I have a Bluetooth media remote with pause/play, skip forward/skip backwards, vol up/down buttons. It has no other buttons. And Microsoft Bluetooth stack requires a passcode, which I physically cannot enter. I've tried Bluesoleil and Toshiba stacks, they require passcode as well. I have not found a way to skip the pass with either of these 3 stacks. The only one I can't try is Broadcom, I don't have their USB bluetooth dongle and their stack only works with their chipsets, it seems. Does Widcomm allow connecting a BT keyboard without entering a passkey?
Windows 10 Bluetooth Pairing Without Passkey