The Legion assault in Val’sharah is bugged. The final guy you must speak to–Commander Jarod Shadowsong–won’t talk to you after even ALL the assault quests are completed. So players who complete the assault–up to the final leg of it–are cheated out of their time, having to wait for and complete another assault (for the Breaching the Tomb achievement). And we’re left to hope/ pray that the next assault also won’t be bugged.
This seems to still be a problem but I found a fix for my particular situation. I had completed the 4 world quests on my 70 druid and then reported to Jarod Shadowsong. I can see him and interact with him but he acts like the Assault of Val’sharah quest requirement has not been satisfied. The Continue button at the bottom of the quest is greyed out. I tried reloading and relogging, with no success.
He does offer Jarod’s Mission as a quest, but that seems unrelated to the Assault and also does not allow me to complete it.
I noticed I had an unfinished Legion questline Aid on the Front Lines nearby in Bradensbrook, which I figured could be affecting the Assault quest phasing. So I went and took a few minutes to finish that chain up to The Matter Resolved… For Now… quest and then the A Gift from the Six quest in Dalaran for my resto artifact weapon.
Once returning to Jarod I was apparently now in the correct phase and obtained quest completion. So for anyone else experiencing this problem I’d recommend checking out whether you have a similar artifact weapon quest available to finish.