ok, nevermind everything i said. After a bit of trial and error i found something that works. And you only need the base id.
first off, use fallout wiki for the base id's
For this quest its
LinkWe find out that the base id is 000E595C
You now go into the console and click somewhere above ground, for example if youre at red rock, click on a tent. You need a reference point to get the npc to spawn. Then type placeatme 000E595C
Speak and continue with your diplomatic approach of the quest
ps. this works for any missing npc