I pre-ordered The Taken King dlc on xbox360 and when I purchased Destiny on disk for Xbox One and all dlc's exept for The Taken King has worked. It now wants me to buy it once again. Honestly I'll buy it again but it's a problem that not willing to deal with again. Thank you for listening to me be a whiny little shite
-
Is it possible you licence transfered TTK at some point? Something similar happened to me recently and it turned out i was technically licence sharing TTK.