Nokia Music for Windows Phone - Why can't I see the option to subscribe to Nokia MixRadio+?

Nokia MixRadio+ is only available in selected countries and on Nokia Music application version 3.6 or later.

Currently available in Australia, Austria, Canada, Finland, France, Germany, Indonesia, Ireland, Italy, Mexico, Netherlands, Norway, Poland, Portugal, Russia, Saudi Arabia, Singapore, South Africa, Spain, Sweden, Switzerland, Thailand, Turkey, UAE, UK, United States, Vietnam.

To check your Nokia MixRadio application version number, go to Settings > About.