problem with the country and region.
I cannot find my country in the country and region option. that's why some apps are not working. Bangladesh is not there in the country region part .
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See the 'Availability of Apple Media Services' - https://support.apple.com/HT204411 - "Learn if you can buy apps, movies, music, books, and more, or use Apple Podcasts or Apple News, in your country or region."
and iCloud storage plans and pricing - Apple Support
- If your country is not listed then you cannot buy anything and your Apple device is not supported in that country.