Solved
Unable to redeem CD keys for Generals and Zero Hour in EA App
I've owned Gererals and Zero Hour CD version for years and wanted to play them again, unfortunately I don't have a CD drive in my new computer (or an external one), so tried the CD keys in the EA app...
C&C Generals and Zero Hour don't exist as separate products on the EA app; that's why their codes can't be redeemed. They only exist as part of C&C: The Ultimate Collection.
