Yes, AMD Rewards gave me a code I put into the CoH website, and they emailed me a steam key.
They don't email any steam key, do they? You activate the voucher code on their website to grant access to the game which was usually done by linking your account up to this date. Clarify this and I'll think about a possible trade.
That is what I read too when originally going to activate, however for whatever reason they sent me steam keys over email. So for full context, the reason I own it already is that I had a friend who had upgraded his CPU about a month ago and got the same key, but he didn't want the game so I got him BOIII and he gave me the AMD Code. I tried to activate it and linked my steam account to the CoH website but it looked like they hadn't fully implemented whatever their system was yet so I couldn't redeem the AMD Code. Well recently I also upgrade my CPU to a 5800X3D which I hadn't planned on doing, so then I had two codes. When I went to redeem the old, it sent me an email with the steam key, so I did the same thing with the code I just received and it emailed me another key. I'm thinking maybe it's because I linked my account before they had their system up? Not sure. I can screenshot the email without the key in it at first for verification.
Company of Heroes 3
Hell Let Loose
Have a CoH3 Key I got from a processor upgrade, but I already own it. It is an actual Steam key, not a third party key.