So I just got done the prestige raid for the first time. I also got the last seal for my acrius as I was upgrading it at the time. The prestige ornament that is given after completion was not given to me. I did get the trophy and the emblem so it counted as a completion
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That’s cause the ornament is part of the quest. You can’t do steps 4 and 5 at the same time thinking both will auto complete. Just do it again