Apple ID, multiple countries, changing store

https://www.apple.com/legal/internet-services/itunes/us/terms.html - May 13, 2019 "Our Services are available for your use in your country of residence (“Home Country”)."

And,

"Terms found in this Agreement that relate to Services, Content types, features or functionality not available in your Home Country are not applicable to you unless and until they become available to you. To see the Content types available to you in your Home Country, go to the Services or visit https://support.apple.com/en-us/HT204411. Certain Services and Content available to you in your Home Country may not be available to you when traveling outside of your Home Country."

Basically the system isn't designed for using stores in more than one country because the majority of users do not have true residency in more than one country.

Realize we're walking a fine line here because we are not supposed to post "workarounds" for Apple's policies on this forum.

I have used a phone that had one account on it and then I simply changed accounts to mine. Some of the old content such as photos was on it until I deleted them. It isn't in tended to be done that way and can lead to inconveniences.

Things such as apps have to be updated using the Apple ID that was used to download them.

In order to change country you cannot have any ongoing subscriptions. You have to wait until they end. Apple ID balance had to be zeroed.

Very likely it isn't related to Apple at all as far as music is concerned. Media licenses go by country or region. If you look at disc cogs web site you'll see the same album may have many different country releases.