Two Accounts on same console, or two 360s, two XBones, or one of each? It makes a difference. Bungie does not support Game-sharing options; however, if your console does then you're good to go. I have an Xbox One, and two 360s with several profiles on each... I had to buy TTK for Xbone AND 360... what a pain in the butt. On the 360... everyone who plays on my Primary console has access to the DLC. On my secondary console only my profile which purchased the DLC has access to it. I'm not sure about the Xbone... I've only played on my Primary account. The sub-accounts with XBL haven't tried using TTK yet.