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Actually I don't know if the "product code error" is given also when a key is valid but already used, I believe it says it has been already used (and sends a mail to that account's email address to warn the owner).
Are you 101% sure you typed it correctly?
The key isn't redeemable on steam.
Activision started with Steamworks implementation in Modern Warfare 2.
Call of Duty: Modern Warfare 2 CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Call of Duty: Modern Warfare 3 CD Keys in this format: 1AB2C-D3FGH-456I7
Call of Duty: Black Ops CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Call of Duty: Black Ops 2 CD Keys in this format: 1AB2C-D3FGH-456I7
Call of Duty: Ghosts CD Keys in this format: 1AB2C-D3FGH-456I7
Call of Duty 4: Modern Warfare in this format: 1AB2C-D3FGH-456I7