I recently completed the Urn of Sacrifice quest line from Eris Morn on my second character but was not rewarded with the legendary gauntlet, in this case, the Thrallskin Brace. I had fully completed the quest line through filling the urn with the eyes, giving that to Xur and then handing in the final portion to Eris Morn. I received the experience and the reputation but not gauntlets. Checked the postmaster last night and this morning but have yet to see anything appear there. My inventory was not full and I was just wearing blue gauntlets so not quite sure why this bug occurred.