For everyone who is trying to get in a dungeon.
The dungeons are right now not working properley. Somehow there is a bug which holds you out of the dungeon. You can’t enter when in a party.
Dungeons aren’t working at the moment. Arenanet still has to give an answer on this issue.
You can post all your problems with entering dungeons here in this post. What time you tried to enter but you couldn’t.
Mine started around 22:45 when I tried to enter the Honor of the Waves.