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

[AC Question]

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.