Xbox Credit: Change Currency?

Do you know if it is possible that if you buy an Xbox prepaid card abroad with a different currency, you can still use it on a German account with Euro as your currency.

It does not work. You have to redeem it in the store where you bought it. Argentine in Argentina, etc. Then you can go with the most with a VPN on the store of the respective country and then buy a game with the credit. You can be banned by it.

Yes will work. You have to redeem it in the store, but then you can only buy things in the currency. So convert is not possible but you can buy German things with eg with pound.
If it does not go write support.