Everyone across the board was marked as ineligible for loot despite it being their first kill. Had a bunch of people from other realms confirm it was bugged.
Seems to be sporadic. I joined a group in progress on Amber Shaper, It said I was ineligible to recieve my bag from him, but i used a coin and got gold normally. Then when we killed Empress I got loot (a bag of course....) as normal and used a coin (gold) and had no issues. So it seems to be a sporadic issue. About half the raid claimed to get the bug on amber shaper, 0 said they got it on empress.