I’m not currently on the quest and it is not showing up at all. I have tried swapping covenants, relogging, reloading, leaving the sanctum and coming back in, swapping characters, etc. Nothing works, it is just not showing up.
I went to wowhead to see if anyone mentioned it and there are people saying this is happening to them too. This makes doing any sanctum upgrades impossible as you need the souls to upgrade.