I submitted a WP7 app for beta testing, I added some live ids and I got the confirmation email which has the zune://navigate/?appid=xxxx-xxx-xxxx-xxx-xxx link included. One of the live ids was the one I am using on my computer and WP7 phone.
When I tried to open that link, Zune tells me: CAN't OPEN, Sorry, the requested item isn't available in your location.
When submitting the app for beta testing there was no option to select the countries for availability, and my understanding is that the beta testing supports all countries.
FYI, my live id's location is UK, so is my computer's location, and I am logged in in Zune with that live id. When submitting the application, the xap packages has the attribute NeutralResourcesLanguage set to "en" - I understood that would make it available worldwide.