Why Emissive light not working in UE5.4/5.5/5.6

Hello, I’m using a emissive light materials on a meshe ( like a cube or a sphere )
It shines but it not emit lighting on the scene.
Lumen is enable and i’ve checked “use emissive light” in the meshes details and post proccess volume and that does’nt work.
The only solution than i’ve found is to switch in old version of UE5 until 5.3.
The others version ( 5.4 / 5.5 / 5.6 ) can’t emit light.
Please help me.
Sorry for my english, i’m french.