Why am I getting an invalid store message on Apple Music?

I've been using Apple Music everywhere like my iPhone iPad and other devices I even used the web version but when I try my Mac it says invalid store even though I changed my store to work it says this - "You are signed in with an Apple Account that is not valid for use in the U.S. Store.  You may only purchase music from the (Said country) Store with this Apple Account." even tho it works on other stores I changed my appleid even to (said country) what's the issue?

[Re-Titled by Moderator]