If you are a Screens 4 user and have encountered a "Cannot redeem code" error while trying to use a Screens 5 offer code on your Mac, please follow these steps to resolve the issue:
Mac App Store
To redeem an offer code in the Mac App Store, ensure your Mac is running macOS 15 Sonoma or later. If you're using an earlier version, you can redeem the code through the App Store on your iPhone, iPad, or Vision Pro.
After the offer code is successfully redeemed and applied on one of these devices, the benefits will also extend to your use on your Mac.
Please be aware that this offer code is valid only for an annual subscription and cannot be applied to Lifetime or Monthly subscriptions.