Bluetooth keyboard not working

I’m trying to pair a cheap bluetooth keyboard.
I enabled BT on the MyOSMC panel, and started discovery.
I can see it, but when I try to pair it (both with and without PIN), it doesn’t work.
the keyboard is working fine with my Bravia TV and also macbook pro.

Try Trust and Pair

I find I have to be quite quick with typing the PIN and hit Enter afterwards.