When I went to claim my emblem & unlock solar after completing the quest, I was unable to unlock the emblem. I can purchase & equip aspects/fragments/etc. just fine, but I can't get the emblem and complete the quest. I tried leaving & rejoining the tower, swapping characters then back to hunter, and restarting my game. I think I know where the issue stems from- I made my hunter last season, but only unlocked solar now. I also completed the quest to unlock arc at the same time, and was able to claim that emblem & complete the quest without issue (I completed the arc quest first). So it's probably something to do with the new light changes between seasons & Ikora now being an actual vendor that's overriding my ability to complete it.