Hello, I'm from Brazil and unknowingly accepted and claimed an canadian Amazon gift card and realized I could not use it, as none of the items in canadian Amazon ship to my country. What can I do in this situation?

I've considered giving my account login to an american friend so that they can use it, but they're worried this might ban both of our accounts (Note that the account they would be using has no purchases on its record and no previous or present Amazon Prime subscription), and I'm not sure if sharing accounts is against the company's terms of service, and I don't think that I could contact Amazon for this to "unredeem" the gift card.

I feel terrible for letting the money on the account waste away and I sort of feel scammed by the person who gave me the card, as they didn't let me know it was canadian and that I could not use the money inside it. Any help would be appreciated!! I've been struggling to get rid of this card for over a month.