There are region restrictions when you take an Echo device from one country to another. What might be available in one country might not be available in a different country. This would apply to music, movies, and even some smart devices such as smart plugs, light switches, etc.
It is also recommended that when you take your Echo device to a different country, you should contact Amazon support to help you reset your Echo device to the new country. You can't do this on your own. Amazon must do it on their side at your request.