Hi ,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
If part of the product key sticker is damaged or unreadable, it is best to go back to the seller where you bought it and explain the situation. In many cases, they can replace it or refund it, since the sticker may be defective.
If the seller can’t help, you can try Microsoft Support:
https://support.microsoft.com/contactus/
In the meantime, use a magnifying glass, or take a clear photo with your phone and zoom in on your PC. But be careful, too much rubbing can make it worse.
This may also help: Microsoft product keys only use these characters:
2346789BCDFGHJKMPQRTVWXY
They never use these:
015AEILNOSUZ
Please feel free to ask if you need further assistance.