Technically, there is a reply from Bungie. The reply is vague, untrue, does not address the issue at hand, and does not even contain a link for Xbox 360. The vanilla game and both DLCs worked on sub accounts. Furthermore, a sub account works on my Xbox One. I'm merely asking for clarification in the inconsistencies. I may not like whatever their response is, but, I'd prefer a flat out "no" over silence.