This has happened a couple times, but if we try to enter a nightmare dungeon as a party we get placed into separate instances, but they seem like the same instance. I can see them on the map off in the middle of nowhere but we each have our own dungeons.
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Same, has happened twice, Kor Dragan, and Witchwater dungeons
Same issue here.
Seems like a bug
Had the same issue with two different dungeons. Tried different party leaders. If we tried to teleport while someone was inside it would kick them out immediately.
same here, tried everything and can’t seem to join the same nm dungeon together
Having the same problem.
I just ran into this issue with a friend of mine. If one of us tried teleporting to the other, the person in the dungeon gets kicked. Otherwise, we would be in our own instance of the dungeon. Tried zoning out together, one after the other, swapping who was the party leader, disbanding, and then partying before going in. Log out and of course, the key was gone by that point. Really hurts trying to do what is essentially the largest part of the game for the end-game… For reference, this was Crusaders’ Cathedral.
Same problem herewe’ve tried several instances, we can’t see eachother inside
Same problem Ancients Lament
Same problem at WItchwood
I’ve had the same bug happen to me multiple times. Ate up 4 of my magic find sigils 
Same bug happened to my team dozen of times. We have lost so many keys
This has happened to us on many different dungeons. I don’t think it has anything to do with the dungeon. WE think it is triggered by teleporting INTO the dungeon itself. We THINK the work around is… stand just outside the dungeon and not IN it. Teleport to your party member there and then all walk in. We have never had it break when we did this. To FIX it once it is broken we have tried many many combinations and the only fix is for everyone to completely exit Diablo iV and come back in. Nothing else would fix it. Even opening up new Nightmare dungeons didn’t fix it.
When it happened to us, it was never by teleporting IN the dungeon, we always walk through the door
It happened again one minute ago. My friend teleported on me in front of the dungeon and then when entering it we weren’t together.
So I guess don’t teleport but go to the dungeon on foot.
That doesn’t work either, happened to me and my buddy today. 3 wasted sigils.
same issue for me and my hubby
hope it gets fixed soon
same here :-/
20chars… 1+3+3=7
Same issue.
I was a party member, popped a T4 Sigil for Guulrahn Canals. Both the lead and I could see the “Nightmare” indication on the dungeon map icon. Once I entered, if they joined I’d be kicked and vice versa. Same behavior if one of us tried to teleport from town to the other who was already in the dungeon. We tried promoting me to party lead and re-creating the party to no avail.
We both exited and then counted down on voice comms to click enter at the same time, and saw the following:
- We were presumably in separate instances – we could see each other’s player icon on the minimap, but could not see eachother in the game (and were fighting different enemies in the same spot).
- We spawned into two different locations of the dungeon – I entered in what I presume is the proper entrance, and my other party member spawned in further. Once they walked back towards me, they actually saw a “fog wall” blocking off where I came from.
- The rewards weren’t synced – the other person completed the dungeon and I got the “Dungeon Complete” popup (including the Aspect associated with the Dungeon), but I got no loot and no achievement etc. like the person who completed it did.
Not ideal 
same problem sadly i need to rushhhhh