@Che93 It was announced that all Founders Edition codes have been distributed. Try checking your Spam/Trash folder and see if it's there.
Otherwise contact Stadia Support and they will be able to re-generate the code for you.
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
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