All of my lights have this warning message below them: “Lighting has been disabled in at least one Scene view. Any changes applied to lights in the Scene will not be updated in these views until Lighting has been enabled again.”
However, in the Lighting tab both Real and Mixed are checked:
I’m currently letting it bake to see if it actually updates the lighting or not, so I’ll follow up when that finishes to see if lighting is actually not being applied.
For me, toggling the use light icon did not clear the message right away. But when I hit play the message went away and did not return when I exited play.
If you see the message in the isolated prefab visualization mode, in order to get rid of the message you need to enable the scene lighting (lightbulb icon on top of the viewport) in the prefab preview, not only in the overall scene view!