For non-static GameObjects to receive global illumination, you need to have Light Probes distributed in the Scene. These provide high-quality lighting for moving (dynamic) objects. Light Probes are positions in the scene where information is captured about the light that is passing through the empty space in your Scene. This information is baked similar to lightmaps and then used when the scene is rendered at runtime to approximate the indirect light hitting dynamic objects, based on proximity to the Light Probes nearest to that object. For more information on Light Probes, see https://docs.unity3d.com/Manual/LightProbes.html and the corresponding subpages.
The difference between light probes and lightmaps is that while lightmaps store lighting information about light hitting the surfaces in your scene, light probes store information about light passing through empty space in your scene. - Unity Manual
A group of Light Probes...