I'm also having problems with this quest. I've completed all steps up to speaking to Bane the second time, which I can't do. Even though there's a quest star on him, when I approach, there's no option to speak to him.
Edit: I figured it out. There were a couple kett still alive in the walls of the base (???). I used my biotic damage aura to kill them.
Same as jackrusselltime, but I couldn't kill them with Shockwave. I've travelled per outpost away and back and drove directly to him, trying to avoid the Kett. Even as I saw an enemy in the radar, the "Speak"-option appeared and I quickly entered the dialogue.
This was the fix for me! Thanks!
Dont forget to change the dificulty to narrative so you can kill the bugged kett inside the walls with biotics more easily.
