I picked up all 4 quests to complete this week’s Venthyr Assault: Duelists, Skyhunt, Weapons, and Even one Worthy.
I completed and turned in all 4 of them; none are left in my quest log.
But the progress on the Venthyr Assault is stuck at 3/4 complete. I cannot continue to the final stage to get credit for the assault.
Is anyone else seeing this? Any ideas how to get credit for the last quest?
To be clear: I completed all 4, and I’ve triple checked that there are no more quests available in the area of the Assault. Nada. I am stuck. 
I know that there were some earlier reports of issues with the Assault. One of the Blizzard replies:
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Thx Kyzera.
I’ve tried that, but no luck. I finished the 4 quests last night, went back to Covenant and then back to Maw assault area this morning (having logged out then back in), in hopes it would somehow “clear”. Nope.
Sorry that didn’t help. 
Perhaps daily reset will help get it back on track.
Best of luck!
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Having exact same issue and daily reseet didn’t help. Me and a guild member was doing it together and the last quest “turned in” but we didn’t get credit for it. I tried finding or getting someone to share the quest with me again but no luck.
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Did you turn in all 4? I accidentally clicked on Draven before turning in my 4th quest. He took me to the platform for the end of the assault stage, despite having only turned in 3/4. Then it all bugged out and I could neither finish the assault or turn in the final quest. I had to leave the maw and log another character before returning to clear it up. I was then able to turn in the final quest and proceed normally.
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Yes, I ran into this problem on my main. I’m going to try leaving and coming back.
This is currently still an issue in 2024. The progress remains at 3/4 as the mirrors are no long accessible, and when returning to Revendreth manually, the reflecting mirrors are entirely missing, unable to be triggered. Thus leaving the final boss unattackable. Leaving the Maw and returning does nothing to fix this.