Sweep can be performed only after completing one auto-repeat/auto-battle with 3 stars after reaching the required Guardian Camp level. Once the "Auto" tag appears next to the dungeon you cleared, you will be able to use the Sweep function.
If you enter the auto-battle and your characters are not automatically fighting, please do the following:
- Tap on the "Auto" button at the bottom of your screen
- Exit and go back to the lobby
- Restart the Auto Battle. The characters should now start clearing the stage on their own.
- Allow your heroes to beat the stage without your interference (don't even touch the screen), and the Auto tag will be added.
- Use the Sweep function.
For Awakening Dungeon Sweep, please note that each day of the week is a different "rift/dungeon" and you need to clear each of them at least once on auto-battle before being able to use the Sweep function.