Hi, welcome.
Have you already tried setting the headset as the Default Communications Device, and what are your results with that?
Since FxSound works best when the FxSound Speakers device is set as the Default Device.
You can also find a troubleshooting list with the most common tips and suggestions bannered and pinned to the top of the forum.
P.S.: Worth adding, perhaps: this thread mentioned the same Jabra device as yours, but with a USB connection (I know Bluetooth is a much more pleasant way to listen),