If you are going to buy tickets for an event outside Norway via Ticketmaster, you must create a separate user account on Ticketmaster's website for the country in which the event is taking place.
For instance, to buy tickets for a concert in Stockholm, you must create an account at www.ticketmaster.se. You may create an account using the same login details (email address + password) as you have for your Norwegian Ticketmaster account, but you will need a separate account for each country in which you wish to purchase tickets.
Please note that tickets purchased via Ticketmaster abroad will not appear on your Norwegian Ticketmaster user account after purchase.