Do you get any errors or warnings in the Unity console?
When testing, do you test this by starting directly in the scene? Since you basically replaced the scene, you'll also have to add a game starter that directly starts the game in that case.
Generally, when a battle isn't starting, it could e.g. be:
- no enemy to fight (e.g. wrong faction selected, or enemies start dead due to 0 health, etc.)
- player is dead
- scene ID already set (i.e. fight already done) or other conditions set up in the battle not valid
- player controls blocked