Basically the quest starts and there is no dialogue or objective markers like there's supposed to be according to walkthroughs. The objective text states "Investigate Hive Activity: Head to Sorrow's Harbor and investigate the strange Hive congregations within," but nothing occurs if you head to Sorrow's harbor or kill enemies. It seems it's bugged in it's entirety.
Bungie has completely destroyed this game... They will never ever get new players now. In the past week I have tried to do new light mission and legacy shadow keep and I cannot complete either due to bugs... I'm just about ready to walk away sadly