Why is the message "This app has not been released in the current region yet" displayed when I use HUAWEI In-app Purchases within an app downloaded from HUAWEIAppGallery?

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Why is the message "This app has not been released in the current region yet" displayed when I use HUAWEI In-app Purchases within an app downloaded from HUAWEIAppGallery?

Go to AppGallery > Me > Settings > Country/Region and switch the service region to the country/region where you downloaded the app. After that, the payment can be completed successfully.

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