There are two issues mixed together in this thread:
1. First, there's the technical issue of Passport launching and connecting to the iTunes Store. Fiddling with the date settings may cure that.
2. The second one has to do with the cryptic interface of Passport. Even when it's working, there's no clear way to figure out what it does or how you use it. It may appear to not be working because it looks like it's doing nothing and there's no way to figure out how to get it to work. If it connects to the iTunes Store, it may leave you stranded at the main page, almost like Apple's Maps app may leave you stranded in the desert. If you do a search on "Passport" in the App Store, you'll get applications that will help you take a passport photo, apps that have visa information, etc. Yes, there may be some genuine apps for Apple's Passport application but you have to guess which ones they are. I had to use Google to find magazine articles that talked about Passport apps. That still seems to be the only way to find them.
Like Maps, this is an epic fail. Apple, please stop promoting and including new "features" of iOS that simply don't work. I just makes you look stupid and uncaring about customers.