I had a similar problem a while ago. I set up a second hard drive with its own O/S and when I installed steam on it it said the installation was on a new computer and sent a verification code which wasn't recognized. I chased it up using a support ticket and after a number of codes which did not work something clicked and everything was fine. Never had a problem since despite formatting the drive and reinstalling everything a couple of times the verification codes have always worked. I actually have Steam installed on three separate drives each with an O/S with just one Steam account without problem.
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