Are all players eligible to use the "Recruit A Friend" service?

Players with a World of Warcraft account from the following countries are able to use the "Recruit A Friend" service: Austria, Finland, France, Germany, Italy, the Netherlands, UK, Norway, Sweden, Greece, Ireland, Belgium and Spain. Players from outside of these countries; players with trial accounts, or with full accounts with five referrals from the "Recruit A Friend" service currently pending, are ineligible.
This is taken from the Recruit a Friend F.A.Q (http://eu.blizzard.com/support/artic...rticleId=30562).

You write that the computer is located in denmark, could that be the answer to your problem?