Okay, so I tried a workaround that let me complete the quest.
Go to faction capital (Org for Horde, and Stormwind for Alliance)
Turn on ‘War Mode’ in the talents section of your abilities (bottom right hand corner)
Then come back and he should be engage-able
Go to the nearest rest area to turn off War Mode when done
It’s a lot of work, but it worked for me. Hope it helps y’all