If you purchased Office from a 3rd party retailer, and you are unable to see the correct product key on the card they provided if it did not scratch off correctly, this forum is just a user to user forum, you will need to contact Microsoft support directly, provide them with proof of purchase and the other details on that key code card and they may be able to provide you with the associated product key or a replacement key, try using this method to contact their support.
Go to this link: https://support.microsoft.com/contactus
Select Microsoft 365
Click 'Get Home Support'.
In the box provided, type billing.
Press Enter, then on the next page, scroll down and click 'Sign in to Contact Support'.
Navigate to Microsoft 365 and Office - Manage my Subscription.
Select the 'Chat with support agent in web browser' option