Is the key from Steam in the format of 4x4 (four groups of four digits)?
You might try verifying your cache integrity with Steam and then checking for your serial again. It might be different and the first one was not correct because Steam was out of keys when you bought it.
There've been a couple reports of this lately. Likely recent M&B Serial Keys haven't been added to the forum system. Will contact the devs and be sure they are aware.
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