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Spatial sound became available when I switched off the Dolby Audio function. The 2 features apparently can't be functioning at the same time, for my device at least. @AbdulMohi1 perhaps you can try what i just did, disable any other sound enhancement feature you may have and then see if the spatial sound becomes available for you.

Apparently the feature won't work correctly unless you reinstall your audio devices: I uninstalled my VIA HD device in the Device Manager and reinstalled it afterwards. Both Spatial Sound modes now work and I can clearly hear a difference. I tested this solution with my Bluetooth headphones as well.