Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello
You will run into this issue if you try to redeem the key purchased in a different country: https://support.microsoft.com/en-us/office/office-product-key-error-this-product-key-isn-t-meant-for-your-region-dd410dcc-ab00-43e5-86c1-64adfc1143b2
It is more a business and compliance policy (pricing, distribution agreements, fraud reduction, local commerce rules) that Microsoft enforces through their redemption system. Their official stance is simply that cross region redemption is not supported.
Changing your profile location doesn't help in this case because it is your device location info.
If you have someone in the US, you can have them redeem it for you for your account, but that means you will have to share account information with them. Once redeemed, you should hopefully be able to use it by signing into your account.