I have a damaged gift card where the code Is unreadable. How to a obtain a replacement code?

The first link works for me, which is the one you need. Here's a different link to the same page: -

https://support.xbox.com/contact-us

Neither of the sites that were sent in your response were actually taking me to the correct location.

re: I have an Xbox card that has an unreadable code. How can I get a replacement code?

If you're unable to read all 25 characters of your digital code, you'll need to request a replacement code by contacting aka.ms/contactxboxsupport.

When you contact support, make sure to provide the proof of purchase, the serial number, and a picture of the damaged code.

Note Please take a picture of the front and back of the card or take a picture of the receipt where the code is printed, so that support can verify the damage, as well.

If the code was purchased from another retailer, make sure to provide the same details when working with the retailer.

Info taken from the support page, here: -

https://support.xbox.com/help/subscriptions-billing/redeem-codes-gifting/digital-code-solution

Help !

I need a replacement code for a 12mo card .. the pin is damaged and unreadable

You might be able to get a replacement code by following this link
https://beta.support.xbox.com/help/subscriptions-billing/redeem-codes-gifting/digital-code-solution and scroll down to code is damaged or unreadable, and follow the instructions from there.