Confused about the beta download

I just paid $119 to get the beta after linking to my Steam account. An email arrived immediately with the following:

Thank you for Automobilista 2 purchase.
Your game keys are included below and are ready to be activated on Steam. Instructions on how to do this are available at the link below.
https://forum.reizastudios.com/threads/how-to-activate-ams-ams-beta-ams-dlcs.1267/
Automobilista 2 beta will be immediately available for install. Automobilista 2 and Season Pass will be automatically added to the same key when each is released.​

But the link goes to "Reiza Studios Forum - Error" "You don't have permission..."

How do I download the beta? It's not in my Steam library.

Thanks for any help.

 

Exactly, my steam code is not working Reiza!!!

 

I contacted steam support, showed the email, they said Reiza have given invalid codes!!!, please Reiza I have linked my steam to my Reiza profile , attemp to activate and the codes are invalid!, what is going on??

 

Codes weren't invalid.

The right place to enter the code is at the bottom left button (+ ADD GAME).

 

Ah! Thanks very much for your help. Downloading now!