Ghost Ship shows as claimed / locked out, received no rewards/credit

I ran the ghost ship as a support, It stated I didn’t contribute enough to get a reward and locked me out of ghost ships for the week with no rewards and no daily credit. Why is it locking me out if I didn’t get credit for the kill? And why do supports get no contribution credit when i was shielding/ healing, hitting the boss and buffing/debuffing the entire fight? (And yes i was in a full party. The other 3 guys got credit and rewards!)