Hi, I'm Bernard, a fellow Windows user. I'm happy to help!
Kindly follow the steps provided by Q&A Assist if you have already installed the key to your PC. If you have not yet installed the product key:
Did you purchase it from a local store or from the Microsoft Store online? If you purchase it from a local store, I recommend asking the local store if they can replace it, since it is not yet in use.
If you purchase it from the Microsoft Store online, you may reach them from the link below: