Someone else had asked this question, and they were not at 1200 miles when they did their service, but when they passed 1200 miles they said it worked. Clearly you are past that so perhaps you don't see the checkered flag when you set your car for launch. Make sure your dsc is fully off. Maybe that was the problem.
2013 Bmw M5-Alpine White/Black-Oem gloss blk powder coated wheels-Expel clear bra-35% tint-Rpi Gtm Exhaust-Rpi Downpipes-Rpi Scoops-EuroCharged Tune-KwV3 coilovers