Maintenance for the week of April 6:
• ESO Store and Account System for maintenance – April 8, 9:00AM EDT (13:00 UTC) - 6:00PM EDT (22:00 UTC)
We are currently investigating connection issues some players are having on the European megaservers. We will update as new information becomes available.
That's quite sad to hear that you can't duel in there. I guess its purpose is to stop more knowledgeable players from spamming duels and owning people new to the game, might not give a good first impression when you are just starting out haha.