I don't know for you, but for me (since day one and never have a bug):
Wait until Bes Isis was aviable. And after few side quest, i don't want spoil, YOU call her for launch this quest
Ah ok, I was not aware that I have to wait this long. My next mission is the one where it says that I cant go back after starting this mission (Nocturne OP55N1) and I figured I was supposed to get Nancys call before that.
Thank you