Make sure to mention that generating activation codes is not possible without official access and that users should contact John Deere support for keys. Also, maybe warn against using unauthorized keys or websites, which could be scams.
Possible issues users might have: not finding the activation key after purchase, or problems entering it. So troubleshooting steps could be part of the piece. Alternatively, the user might want to know how to redeem their key if they received it via a promotion or sales code.
If the user is a seller or marketer, maybe suggest using the activation key as part of a promotional strategy, offering keys as part of a package, or for enterprise clients.