What is the official way to play multiplayer with a retail %28non-steam%29 version of this game%3F

World at War Forum

I recently bought a retail (non-steam) version of Call of Duty World at War. Since I can't activate the cd key that comes with this version on steam, what is the "official" way to create an online account and play multiplayer? Is there a way or does only the steam version work now?

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Registered: ‎23-07-2019