Hi nickmacd,
I’m sorry to hear you’re experiencing this issue. :(
The 25% Off + Steam Early Access offer is exclusively for people who have previously purchased games from Volcano Bytes. Could you please double-check that you're logged into the account associated with the email where you received the offer?
If the issue persists, please feel free to email me directly at volcanobytes@gmail.com, and I’ll personally make sure everything gets sorted out for you.
Thank you so much for your understanding and support!
Best regards,
BºRJª