Happened to me and some guildmates as well. You have to abandon quest, pick it back up (thankfully nearby outside the palace), find the clues, and when one of the NPCs says they’ve found something and you can talk to the lady sitting at the desk upstairs, you’re good.
This time I talked to the NPC before I discovered each clue . And after i discovered each clue they had something to add And then quest told me to go upstairs.
This time I talked to the NPC before I discovered each clue . And after i discovered each clue they had something to add And then quest told me to go upstairs.
This worked for me after I abandoned the quest and tried again. Thank you!