Why does Xbox only allow customers to redeem Xbox Game Pass subscription codes within each country/region? Country-specific (or region-specific) subscription cards allow us to ensure that the Xbox Game Pass service reflects the local market economy in which the Xbox Game Pass subscription was purchased and redeemed.

Game Pass isn't exclusive to the US. I'm in Canada, and I have it. "An active Game Pass subscription is required to play games. Some games may be available only to account holders 18 years and older.