I live in Seychelles I can't purchase games from this region

My friend send me a gift card but i can't redeem it.

it say "This code can't be redeemed. It was purchased in a different region from your account."
how do you redeem the code from my friend that live in different region.

You cant. Your friend will have to request a refund for the code and purchase a code for you that is meant for your region.

Macedonia it's not among the Xbox supported regions, this is why you can't choose it as a region for the Xbox, at the moment from your region it's not possible to make purchases in Xbox store until Macedonia becomes a supported Xbox live region

I can't understand this. How do I even know when I purchase a game which region is it for??

This console was a gift from an italian relative. Why would I have to migrate my account to another region? In all other games I've purchased/downloaded, the region validation was previous to purchase.

Anyway, I'll contact those phone numbers... This region restrictions are basically a bummer...

But I am in the US, and I'm not on some random military base. I'm just living in a normal neighbourhood, but it says my store region doesn't match with my actual region, and thus I can't purchase the game pass.

Hello,

The reason you may be experiencing this sort of issue is because your region is not officially supported by Xbox LIVE. If a game is not available in your region you're going to have issues purchasing and downloading games in that region.

Unfortunately, there's no way to resolve this issue as you have a region mismatch. I suggest from this point forward if you're not able to make a LIVE account in your own region to only purchase disc based games and not anything from the marketplace as there's
no way to know which games will give you this issue and which won't. There are also no refunds on digitally purchased items on the marketplace.