@Bouzzy Do you mean that you ordered the Founder/Premier edition, but haven't got the code yet? If that's the case, is the order shipped yet? You can get the activation code after the package has been shipped. If it has been shipped but still no code, you can contact Stadia support to and they can help you re-generate the code
Go to the link below:
https://support.google.com/stadia#topic=9634925
On top right, click on 'Contact Us' > then request chat/callback to speak to a representative. Try it from a computer browser if the option is not shown on mobile