I have just started the above mission and in KDF headquarters I have to defend chancellor Jmpok I go to where the circle is and can see the yellow circle on the map. But nobody is there no enemis and no chancellor is this mission buggy or is there another way to complete it.
I see from your joindate that you're one of the new players.
Before your time, so to speak, the map you're playing one (minus the damage) was the First City map.
The First City was revamped but the missions themselves were not touched.
The Chancellor is above you.
There's a ramp in the large room roughly at the center of the map that you need to use to go up to the top.
There you will find the Chancellor.
Since the mission was not touched it of course does not take into account that by the time you were suposed to play it back then you had run around the First City Map so often you were supposed to know by heart where you can find him.
So it's not a bug per se, but more like a forgotten aspect of the game.