Where did this come from? If a graphics card, it may be difficult to gift it.

I had this happen a short time ago where I got a new GPU and they gifted me a game I already owned and I tried giving it away on here and found that I had to run through all these time based verifications and basically only I could redeem it.

If you have just the Steam key, you can give that to someone and they can claim the game and that’s that. But you may not want to post it directly on somewhere because bots are known to roam the internet and steal them first to sell them on weird websites.