Razer BlackShark V2 X – 7.1 Surround Sound stopped working after reinstall / AUX splitter

I have a Razer BlackShark V2 X and I had already activated the 7.1 Surround Sound using the official activation code from Razer, and it was working normally. After I temporarily used an AUX splitter to connect an external speaker, the 7.1 surround output stopped giving sound. Now when I select Razer 7.1 Surround Sound as the audio output in Windows there is no sound, but when I switch back to Realtek speakers the sound works fine. I later realized that I had uninstalled the 7.1 software, and after reinstalling it I was logged out of my Razer account. Unfortunately I don’t remember which email I originally used, and I may no longer have access to it. When I tried creating a new account and registering the headset again, it says the device is already registered. I’m not sure if the 7.1 activation can actually be lost because of this, or if this is just a Windows or software issue, so I would appreciate any help or guidance.