apple tv app on fire tv stick 4k

i have an issue to sign in to apple tv app on my firestick 4k. i have updated the firestick to the latest version and even use VPN but it always saying "unsupported region".

i live in indonesia btw. my firestickregion is US.

kindly need your helps since the main reason i purchased this firestick is for watch movie i purchased in my apple tv ID.