The final TDS group mission, Confronting Calix, appears to be bugged. The NPCs within the instance never trigger the event, so the mission cannot be started. Calix Quirinus, the trigger NPC, is supposed to begin the event when hailed. Instead of triggering the fight, he just responds with standard low-faction insults. I tried requesting the event multiple times, with and without a mercenary in my party, and before and after recent server downtime. Nothing I could do would start the mission.
Have you tried saying the keywords [daughter] then [Lanys] then [You are the one with a desire for death] to start the event? Also if Calix is giving you low faction messages, you could try sneaking and saying these keywords.
Did the sneak trick and it worked. Still odd that Calix wants to kill me, but since my faction is too low, he wont kill me for now.