Subclass quests are from the Vanguard faction, hence why it's not rewarding you. There's no arguing that, it's obvious. His point isn't moot. And missions completed now can't be taken again either. Only reason you can do main story missions for the rewards is because those were remade, and count as new. It's an "Abandoned Quests Kiosk." Quests you completed aren't abandoned. And, again, that's exactly what they said. "will not retroactively grant awards." What part do you guys not understand?