GameObjects do not reflect the objets in the scene

Hello,

I have some prefabs in my scene that have a reflective surface. However, the reflective surface does not reflect the objects in my scene but the skybox. As you can see on the captures it is the skybox (represented by the cow and the grass) that is reflected and not the objects in the scene (represented by the walls, the floor, the furniture, etc).

Is there an option to be activated in Unity or on the prefab so that the reflection is done on the objects of the scene and not on the skybox?

I would like to point out that the prefabs in question do not have a "Reflexion Probe" component in their current state.