Howdy,
Just wanted to take a quick minute to report a rather interesting bug. Recently (the last month or so) I decided to complete the Necrolord campaign on my Mage so I could try out Necro Frost. However, I am what you’d call an anti-completionist. I do the least I can get away with. So as soon as I found out that Emeni required me to do stuff with the Stitchworks, I bailed from the quest chain. As a result, my Mage cannot choose the Emeni soulbind. This is obviously normal. My DK, likewise, cannot choose Emeni, also normal.
However, any new character that I level or with which I complete the intro questline (where you raise your runeblade and such in the sanctum) is able to choose Emeni. I recently leveled a monk, who was able to choose Emeni immediately after unlocking Marileth and speaking to the construction assistant where Emeni is during her quest chain (Emeni herself is not there on these characters). Likewise, I logged on to my other monk who had not completed the aforementioned intro to the Necrolord covenant. This monk also was able to talk to the assistant and gain the Emeni soulbind.
tl;dr: Characters who had not joined the Necrolord covenant prior to completing the Necrolord campaign on another character have the Emeni soulbind unlocked. Those who did join prior to the campaign completion do not.