What do you mean you turned on the sun?

If I create a brand new scene with a mesh with some color and run it, it's dark if I use omnilight, but lit if I use directionallight.

    signup you can use

    And in that node you can create procedural sky, and other params.. no need for light bulbs..

    BTW i saw a video some godot dev was telling that they implemented light in webexports or android exports but its comming in 4.3 version.. maybe its related