I’m having a bit of a graphic issue here. Reflection Probes do not reflect PPV2, which is strange because you can see the Post Processing effects on the probes themselves, just not any object the reflection probe is passed to.
Post processing has no impact on reflection probes themselves, only the final image that has been rendered. Reflection probes are a neutral capture of the scene & skybox.
And that object looks totally correct for a dielectric, (aka non-metallic) object set to a smoothness of 1.0. Presumably you’re using the Standard shader? Set the albedo to white & metallic value to 1.0 too and it should look exactly like the reflection probe preview.