Can't start dungeon quests - Froustmourne

Hi. I recently dinged lvl 80 on my mage, and I noticed I can't get any in-dungeon quests, like "Brann's exploration", or the quests at Utgarde Pinnacle. This has only happened with my mage, I have several other characters on Icecrown which didn't have that problem.

When I ask members of the party to share it with me, it says "I'm already on the quest". On the quest givers, it only shows dialogue options, and not the gray exclamation mark suggesting that i'm on the quest. I didn't complete them before on this character either.

Help appreciated! Thanks!