Can't connect K63 OR Harpoon over Bluetooth

This is making me nuts. I can't get either of my Corsair products to connect to my Win10 laptop over Bluetooth. The only way I can use them is with the USB dongles (don't get me started on one dongle per device...)

 

I can connect other devices over BT - Xbox One controller, various headphones, a Wacom tablet - but neither of these Corsair devices.

 

When I go to "Add Bluetooth Device", Windows will at least see the Harpoon mouse, but it just keeps loping back to "Try connecting again". It won't see the keyboard at all. I know the keyboard and button presses, but they simply don't work.

 

I've got 2 of my 3 USB ports tied up with Corsair dongles... it'd be really nice to free them up.

 

Does anyone have any suggestions or guesses?

 

Thanks in advance.

Turn off the other BT devices, and then try to connect the K63 first. Also, what version of BT is your laptop running?