I have a similar problem.
Windows 7, when i see in the "volume control" i have the bluetooth headset "default".
when i press the "test sound" button in the volume control show a little green bar moving, but my S9 does not show the green light when is pair ok with other systems.
The light in the "s9" show a "red light" blinking (slowly).
In my opinion, windows 7 tell me ok with the pairing but the headset not.