I put an object (a puddle) in my scene and I used a Principled BDRF with Metallic set to 1.0 to have screen space reflections. I enabled them in the render configuration and I can actually see them in the (rendered) viewport. However, when I render the project (F12) I cannot see the reflections (only the environment map reflection, not objects reflections). Should I enable them somewhere else?
I finally found the problem. I set the rendering samples to 1 and this (I assume) makes it impossible for the raytracing to bounce to the reflective surface and render the reflection. I am wondering why this works, instead, in the viewport (with samples to 1).