This was a bug that we were able to fix quickly, so that the quest began to behave as expected earlier this afternoon.
However, we have an additional hotfix to clean up the situation for players who didn’t receive credit in the first place, and for this second fix to work, we have to perform realm restarts. We’re planning restarts for 7:00 a.m. PDT tomorrow.
Logging in after the restart and going to Oribos should cause your character to receive the missing credit.
Please note: to receive the missing credit, affected players will need to log into the game and enter Oribos before next week’s weekly raid reset.