I have similar issue with Nokia Mix Radio subscription. For the past 2 months my subscription ceased because somehow it connects to Microsoft US store which can not validate my credit card which is non USA credit card. I live out side USA and always use my non USA credit card before it ceased around 2 months ago. I never change my credit card why suddenly I can't subscribe ? Why suddenly I was directed to US store when processing payment, before it always direct to my local store in Indonesia ? Microsoft please fix this, I love Mix Radio now but I hate the limitation for non subscription. I use Lumia 1020 WP 8.1 developer preview.