You should contact xbox support to ask when the key was invalid and provide us with a ...

Hello,

I do believe that you should contact either the Steam Support team about your issue with the invalid key code or Contact the Xbox Support team.

support.xbox.com/.../contact-us

Hello there, you should contact the seller to see if they can provide you with a Games for Windows Key.

The seller gave my money back for this problem and i tested another different key but it seems to doesn't matter of the key the game is continuously says "INVALID CD KEY" to me.... that's weird the CD key was provided by Steam and i bought the game on Steam
workshop

Umh actually the Steam Support Team is the one who had to give you a valid Key, cause they can check if is actually an invalid code, and give you another one.

Xbox LIVE and Windows LIVE is not related to any kind of codes provided by Steam, cause their system and our system are complete different.

But as they said, that "we" had to give you a new code, then use the Contact Us area, to speak with the official Support Team, so go to this link and use the suggestion of the phone call or the chat with the Microsoft Support:
support.xbox.com/.../contact-us

Hello.

Recently i bought a digital key for Cod that comes out this 25th october, the seller said that the activation for the key is at

the release date,...

Where did you buy the game code from? Was it a key selling platform like G4A or CD-Keys or Kinguin or something like that?

Be aware that there are often scammers that try to sell fake or stolen codes to unsuspecting victims.

Usually, if there are problems with the code, the seller then asks you to contact the Xbox Support, asking for information that the Xbox support can't provide due to privacy reasons.

Since the sellers know that, they can continue to sell "fake" keys, telling the store that they wanted to refund you, but *you* didn't provide the necessary information for the refund.

And so the sellers can continue to scam people on these key selling platforms.

Also, you could contact the Activision support, asking if the code is valid and just not activated yet.

You should contact
Xbox Support for assistance with product keys. It is best to request a callback.