store region blocking purchase of App

If you are unable to purchase an app due to a mismatch between the store region and the payment option, it is likely because the billing address of your credit card must match the country/region of your Microsoft account. To resolve this issue, ensure that your payment method's billing address is set to the same country/region as your Microsoft account. Additionally, check if the app is available in your region, as some offers may not be accessible depending on your location.

References:

• Microsoft Marketplace FAQ
• Purchase apps on Microsoft Marketplace