Shaddows During Render

Hi everyone, I am very new to all things 3D especially blender. I am learning as I go with a few short courses thrown in (Udemy), but I am stuck with shadows. I think I have the scene lit to my satisfaction, but as you can see the table does not cast a ground shadow.

I have tired to add a second material to the floor, and set this to shadows only (which seems to work in the material preview)…but still no shadow.

Any ideas from the community?