At this moment the Nya’lotha entrance is in Uldum but I can’t see it there. I see other people standing in front of it and going in and out but not the actual platform and portal itself, which makes me think it’s not a phasing issue. I’ve done all the quests including the one leading up to Nya’lotha. Turning Warmode off and on and relogging hasn’t helped either.
Update: Ok I think I just randomly fixed it, I took the portal from Boralus to Silithus to go to the Forge, and I zoned into the original version of Silithus. I talked to the NPC to take me to current Silithus and I suddenly noticed the Nya’lotha portal icon pop up on the map in Uldum. So I rushed to Uldum and behold, I can see the portal!
So apparently when your Silithus phase is set to the old version, this occurs. Only weird thing is, I don’t remember talking to that NPC to see old Silithus recently.