Pairing a keyboard

Hi, First-day newbie here.
I'm having trouble connecting my Logitech K850 via Bluetooth.
I have installed Solaris and it is showing my Logitech M720 Triathlon mouse which is working fine.
There is no sign of the keyboard when I do a search.
Any help is much appreciated.

Welcome to the forum.

What is the hardware exactly? X86 or Sparc? Make/model?

What interface are you plugging the keyboard dongle into?

Strictly, it's not a 'pairing' issue. The dongle just looks for the keyboard if it's plugged into a powered inferface. The machine is not seeing the dongle for some reason.