Duplicating a scene in unity

I want to simply duplicate my Level1 scene to create a Level2 and add on to it. When I duplicate Level1 it creates scene labeled 'Level2' then I have a game manager object where I have it set up to load Level2 when you beat Level1. I get an error every time from Unity that is the following "Scene 'Level2' (-1) couldn't be loaded because it has not been added to the build settings or the AssetBundle has not been loaded."

How do I fix this? is it possible to duplicate the scene? Also I did try to rename Level2 after it was created to see if that would work, and it didn't. the Level2 scene was also saved in the Assets folder alongside Level1.

Thank you.