Why does my key not work?

Hey guys,
i just bought a rust key, but at the time wile my paypal window was open they keys all got bought but i still payd the money and they gave me a code. So I entered it to register myself for rust, but it said No valid Beta Code. So i dunno what to do now. pls help i really wanna play this game :frowning:

(User was banned for this post ("missed the support sticky" - postal))