Why is my 'HDRI Sky Cubemap Sky Light' only showing up in my reflection plane? It won't show up in the sky like an HDRI Backdrop. I'm trying to mix an HDRI sky with a Directional Light's sun

I very much enjoy the sun system from a directional light, but the clouds often don’t have as much “punch” to them. When using the HDRI sky, it covers the sun.