Bluetooth keyboard wont pair after bootcamp

Hi

I have an anker rechargeable Bluetooth keyboard model A7721 and i just installed bootcamp. I read online that I had to unpair it and re pair it in osx for it to work in bootcamp, so i unpaired it then when i try to repair it does not show up in the devices tab. About 15 seconds later i get a message to enter a pairing code but that goes up for about a half second then goes away. Please help me as i dont want to have to buy a new one.

Thanks.

I made a recording of this below

https://www.youtube.com/watch?v=GfGThZqKwHQ