Mouse X and Y not mapping to Cube Render Target

Anyone has any ideas on how I can map the rotation values from the First Person template file (looking up, down and around) to reflect and update simultaneously on a Cube Render Target during Game Mode?

To add more context, there are two cameras in the scene - one Scene Capture Cube attached to the First Person player, and another camera (CameraActor) that is simply pointing at the object with the Cube Render Target (this is what the player will see during Game mode - see reference image).

The goal is to have the rotation updated and reflected precisely and instantly from the First Person view to the Cube Render Target on the geo.

Thanks in advance!