Why can't I see the reflection of my pawn?

I want a mirror.

I made this material.

I put a light and scalability in cinematic… however I only see the reflection of the sky

And a bit of the scene in a corner…

I can’t see the pawn… or the actors in the scene from any other angle…

I’m not sure what the problem is.
Someone knows?

Thank you so much!!

I found the way…
I never thought that making a mirror would need so many things.
Anyway, here I leave the configuration of the necessary elements.

config2

config4