I've completed all 8 Lightfall campaign missions on Legendary, but I don't get the choice of Exotic from Nimbus. I made sure to speak to Zavala and Ikora, then Nimbus. I double-checked that none of the missions haven't been completed on Legendary yet (the Triumph screen, my acquisition of the Legendary banner, and the campaign replay selection screen confirm this). I also went ahead and replayed the first mission on Legendary as well just to be sure. I'm unsure what's wrong and am hoping someone at Bungie or the community can help me resolve this.