Rust key invalid?

Hi. I purchased rust while it was in alpha version from an auction. Now i am entering it into my steam and it says the key is invalid.
Do not tell me i have the wrong key or I’m not entering it right. Everything should be working but it isnt.

Have you made an account with the key? If so, log in to http://old.playrust.com and redeem a Steam key. If not, I’m afraid you’re too late.