High Stakes (Telos Station).
I spoke to Luxa and arrange to meet Slusk. I then went and spoke to Harra about his gambling problem, then to Doton and said I wouldn't pay, then back to Harra who suggested I speak with the Exchange. However, I couldn't speak to Luxa about it - no conversation dialogue was initiated with her and only a speech bubble popped up telling me to come talk to her once I dealt with Slusk. Of course, once this was done she was dead and I couldn't progress this side quest in that direction.