Yep I have a ground plane but both the Key Light and the Fill light are well above everything in the image. There is nothing between the light and the objects. The Key and fill are both Distant Lights.
They’re about the equivalent of 20 feet in the air and there are no objects higher than 2 feet between them and the characters.
It doesn’t really matter where the distant lights are positioned but are they rotated along the x-axis to point up. If so, then it’s most likely the ground plane that’s blocking the light if you have the light set to cast shadows.
Switch your viewport view to look through the distant light, if you can’t see your figure because it’s blocked by the ground plane, then the light will also be blocked.