Hi.I was having the same problem:Tracking the cab's, scanned them but nothing happened.I found a solution for this i think it helps you.Follow the steps: 1.Open the journal. 2.Track an Epistrophy job(the location you choose depends by you) 3.Remember where the location is on the map. 4.Open again the journal and choose other job,other than you pick in the Epistrophy quest,and far away from it. 5.Go to a fast travel point.Fast travel to the nearest location nearby,where the cab must be.(If its not working,try travel around 2-3 times in different directions,far from the point where the cab is.) 6.If the normal Delamain call's you,dont press the button for pickup the call.Let the game automatically pickup the call. 7.When you find a cab it must start scanning it automatically.DONT use V's manual scan.