@Pickelz You should get in touch with Stadia support again, and they'll be able to look up your code. Try requesting chat for faster response
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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Stadia Guides are not employed by Google. Opinions are my own.
