7.1 surround sound activation code

Hello, I recently bought some Razer Kraken X Essential headphones. My problem is that they didn't come with a code to activate the 7.1 surround sound. I saw that they were supposed to include a scratch-off card, but the card doesn't have anything to scratch off. Where the code should be, there's only a QR code that redirects me to the Razer website. I would appreciate it if you could help me by providing an activation code or something similar. My seller isn't responding either, so I can't resolve my issue through them.