My 7.1 surround sound already in use | Razer Insider
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So I bought and registered my headset and I got my 7.1 activation code, but it says it's already in use. I'm logged in with the same account I registered my barracuda X.
Be sure it's properly typed, check for any code mismatch like 0 (zero) and O (capital "o"), I (capital i) and 1 etc.

If the code is activated, then it's bound to your account.
Same thing happened to me. I typed it for the first time but it says already used.