[2021] Doing Granum void, not getting Sister to spawn?

Hey Tenno. The only reasons you would not be spawning a lich would be:
-You don't have the proper quest requirements. (You need to have completed Call of the Tempestarii)
-You have an active Kuva Lich
-You did not use a Zenith Granum Crown to enter the void and complete the first level

If you are still running into this issue please let us know and we can look into it!