by Kale » Sun Oct 03, 2021 9:57 am
The two key points to encountering Sariis are to: make sure you are in the correct area (Vecchio Palacio), and make sure Sarah is equipped with the (Elven Astral Outfit).
If the encounter still isn't triggering even with the Elven Astral Outfit equipped, you may need to leave and then re-enter Vecchio Palacio to reset the event. It is also not necessary to move around on that map, and I believe the event will trigger faster if you actually just stand still.
I recall older versions of the game had some issues with the quest, but I believe you can still "clear" the quest from your quest book, at the very least, even in older versions. Newer releases hopefully work as intended. Good luck!