According to Razer website, THX Spatial Audio is not supported by all games. At the moment only the games mentioned at the website: https://www.razer.com/p/RZ11-13000-0001
Also do you have the Razer's THX Spatial Audio App installed which is what enables the 7.1 Audio in your headset during game play?
Go to Windows Sound Panel and see if your Headset Audio is showing and it is the "Default Audio Device". If it isn't showing right click and then click on "Disabled and Disconnected" and see if your Headset are showing that way.
If you have your Headsets connected to a separate Sound card see if it is showing in both Windows Sound Panel and Device Manager.
Also go to Device Manager and see if your Headset is showing as enabled.
How is your headset connected? to the Motherboard's Audio port or USB port or Sound Card?