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I have US, UK and French accounts switch between them to get to the different app stores. I use a DNS service too of course.
 
It'v very easy. Just not as seemless as I'd like it to be.

Currently you have to go to settings and switch the account that way.

I'm hoping in future, the Apple TV Remote app could identify what account was being used an automatically switch to that one if inside the main UI or 'TV' Or a simple Siri command from your iPhone that would be authenticated with touch ID or Face ID?
 
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