From the few Wowhead comments it appears to be non-interactable on characters that have done the Azj Kahet campaign.
The strange egg in Hallowfall is visible and glowing but no interact icon appears.
Full proper UI reset does not help.
Party Syncing with a character that can interact with the egg does not help. The alt character can loot egg and get quest item. At no stage can the quest be shared or the item sent over (it is soulbound)
The alt character that can see the egg has not stepped foot into Azj Kahet zone. This seems to be the common denominator on quest availability.
Unfortunately I need to do the quest on this character and not an alt. Hope it gets fixed someday.
Yes, I’m in the same boat. I’m trying to finish all the quests on my main and have ran into many issues regarding this. I’m wanting to complete it on my character, not an alt.