Solved! I can’t connect Harman Kardon SB20 Bluetooth with smart Samsung ua55mu6100

Solution
Did either of the devices have a tick in the box named "Only visible to paired devices" or something like it? That's the cause of many such failures but removing that tick clears the way.
Did either of the devices have a tick in the box named "Only visible to paired devices" or something like it? That's the cause of many such failures but removing that tick clears the way.
 
Solution