You need the Warmaster’s Key to open the door to progress the dungeon for these quests. The Warmaster spawned behind the locked door though. We were able to attack him through the wall, but the key dropped too far to pick up, so we cannot get into the room.
I have a screenshot but it won’t let me post the link.
+1; screenshot also available.
I can also provide a screenshot as this happened to me and my buddy as well
I also have a screenshot of this happening to me.
+1, have scheenshot if needed.
same here, did restarting fix it?
i didn’t restart it that day, went about other business. pretty sure i did the quest… yesterday? warmaster spawned correctly. might be fixed?
still pretty annoying to have to redo the dungeon
This happened to me today as well, so it’s still bugged.
Just happened to me as well.
spawned behind door, do blizz check these posts?
Just happened to me today, just so others are aware it appears to still be bugged. Have a screenshot if blizzard looks at this…
Same here, cant complete the dungeon, no key, something behind the locked doors but cant do anything.
April 24 and still not fixed
@blizzard, 1 year… this bug have a beard now… 
bump this, still happening
Still cant find it in the patch notes…