Yeah, it happened to me too. It's probably a broken quest. I couldn't figure out anything to get past the door, either. Hopefully they realize the quest is broken and try to fix it with their next patch.
Pierce: Here's a molotov, do you know how to use one? MC: Yes, Pierce, I know how to throw a ****ing bottle!
Make sure the quest marker is at the door you need to go through (I had to run to that start of the dungeon to make it move). Then talk to the elf and he'll say someone has to stay behind to stand on the switch, and then you choose who stays.
Dovie'andi se tovya sagain. It's time to toss the dice. GT:yan templer
^-- is correct and also make sure that you stand where the yellow marker is and talk to the fae that is in front of the door, it will ask if you want to go in and you will be able to. I did save and went back to the main menu and reloaded and then it worked fine :)