Hi there, I'm so sorry for the inconvenience (I didn't know).
Is there a way I can contact you to give the game to you in a alternative way?
Maybe steam chat? Could you add me and I send it as a gift over there?
Rotogamer (on Steam)

I have sent you a friend request, please accept it, then I'll send you the game via steam gift, and, once you have it, please confirm here (on steamgifts) that this worked (I don't know another way to do it).
Don't worry you'll get your key! 😅😉

I'll try to keep an eye for things like this the next time... 🤷‍♂️

(I made a few mistakes on some of my giveaways,
too many sites, too many ways to do things.
I think, this one happen on Indiegala. Basically, something went wrong
with one giveaway (here or on IG) and I ended up giving it away there,
but the site still allowed me to use the "Show Key" button, months after
giving it away. Sorry).