Q: How to connect (pair) the new Magic Keyboard to Windows 7

I have recently bought the new Magic Keyboard and so far I'm enjoying it on my apple devices. I would like to also connect it via Bluetooth to my work laptop which is Dell Latitude E5450 with Windows 7 64 bit on it. I can connect the keyboard using Lightning/USB cable and use it like a normal USB keyboard, but when I try to connect it to Bluetooth, windows finds it and asks me if I can see a random number on my keyboard. I tried typing the code with my keyboard and hitting return key but it never worked for me. Does someone know the answer out there?