I can see the reflections on the cup and plate in viewport but not in the final render. But there are white dots in place of reflections, you can see the dots near the handle of cup.
I'm new here, I'm following blender guru's tutorial and this cup & plate are not showing reflections
when you say “viewport”, which view? eevee? what are they going to reflect other than themselves and the table plane? can you show an image of the viewport with the reflections? It looks like they’re reflecting your light source just fine