I had exactly the same issue than JimGood, with the same lighting setup, and similary interior.
I tried to add a Directional Light, but same result. I can create my owe topic, but it’s exactly the same issue, so If Jimgood is ok, I post my test here.
So, I did fews tests : add directional Light, increase lightmap’s floor ( 2048 ), increase World Settings ( 0.35 / 100 / 5 / 10 )
But still no shadows.
I know, is it possible, because I bought Evermotion ArchInterior for UE4, and you can see :
Are you baking with production settings? Is 2048 large enough for how the floor is UV’d?
Set the directional light to Stationary, there’s some advantages over static (which should generally only be used for less important lights when you are already using some stationary lights).