Happy Holidays everone!

I have a question for anyone who can give me a hand.
First of all, I want to clarify that I live OUTSIDE of the US, so all of this could just be due to it.

I have an Nvidia Shield TV and since the last upgrade, I'm able to access the Amazon Music App, but I get an error message saying that since my account is not from the US, I can´t actually use it.

Is there a way to work around this? If I sideload the app, will it be the same?

Thanks!