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Trying to register my game on here and the CD Key for the base game, CKII, is missing. I have all the CD keys for the other DLCs but CKII is missing.... Help.
Just in case it doesn't help however, I'm moving your thread to the Forum Help / Issues / Rules forum, @TinyWiking lurks around there and can help you solve your issues better than we can here in the CK2 forum.
You don't need to register it, as long as you have it on your Steam account it will show (which I can see it does). Are you by any chance talking about the Games part of your Paradox account section?