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Can't activate FM 2009 key on Steam.

Can't activate FM 2009 key on Steam.

I bought FM 2009 from e-bay and but can't redeem my key to steam.. It says my code is invalid. And I'm curious my key is 20 digits but I learned FM 2009 steam activation key is 25 digits like below. Football Manager 2009 CD Keys in this format: 1AB2CD3FGH456I7JK8LMNOP9Q Should I do another step to get steam code? Or just my key is not valid? I only can play with steam since I've purchased just cd key from e-bay seller...
I bought FM 2009 from e-bay and but can't redeem my key to steam.. It says my code is invalid. And I'm curious my key is 20 digits but I learned FM 2009 steam activation key is 25 digits like below. Football Manager 2009 CD Keys in this format: 1AB2CD3FGH456I7JK8LMNOP9Q Should I do another step to get steam code? Or just my key is not valid? I only can play with steam since I've purchased just cd key from e-bay seller...