Hey there! Try to play around with the light intensity value as well as the Indirect Lighting Intensity value to see if it does anything. Try really big values with “Indirect Lighting Intensity” To know if it’s doing anything, something like 500000 would be fine.
Also, make sure you have Lumen enabled in your project settings and that your lights are set to movable or stationary!
Hope this helps in some way. Have a good one!