Pairing Bluetooth keyboard to Android KitKat, but it won't display pairing code on screen.

Bought an Android headunit off of eBay. Came with 4.4.2. Everything works fine, except the ability to pair any Bluetooth item that requires a pin code. when I go to settings - Bluetooth - Search, it finds it. I select the keyboard, select connect, but it won't display the PIN code needed.

I have tried this keyboard an 4 other different (Asus, LePan, Amazon TV, and a no name Android) android devices, no issues, just this one.