I still don't know enough about your project to help. It sounds like everything was working fine in the duplicate and suddenly it stopped working.
If you duplicated your composition in the Project Panel then you have a duplicate and it will be exactly like the original. If you then worked on some part of the composition and the lighting stopped working you've turned something off or made some other changes.
Pressing the a key twice will bring up a layer's 3D materials properties. Make sure that accepts lights and cast shadows is set the way you want them.
Without seeing the properties of your 3D layers and your lights it is impossible for me to do anything but guess...
Okay so after duplicating the duplicate brackets no longer exsist, but the lighting does not work. How do I get into the 3d settings for the lighting or the layers?
Idk if this helps, but here's the original with the ambiant light I have turned off.
Here's the duplicate with the ambiant light off, the character is not recognized as either a 3D object or something else, but either way is not lighted.
The brackets shown in your first screenshots have nothing to do with lighting or layers. Then just indicate that you're looking at the the Layer Name (brackets visible) or Source Name (brackets not visible) Check the Column Name. Change by clicking the column name.
How did you duplicate your composition?
The proper way to do this is to go to the Project Panel, Select a composition in the project panel and choose Edit>Duplicate or use the keyboard shortcut Ctrl/Cmnd + D.
If that's what you did and your lights don't work then I need to see your project. You don't need to include the footage.