Plane.RayCast not hitting at all

Hi all,

I'm trying to find the intersection between a plane and a Ray in C#, based on the "onScreen" mouse position, but Panel.Raycast never hits. ¿any ideas?

 private Plane aimPlane;
 
 void Start()
     {
         aimPlane = new Plane(new Vector3(0, 0, 0), Vector3.forward.normalized);
     }
  private Vector3 InputPosToWorld()
     {
         Vector3 screenPos = Input.mousePosition;
 
         // Cast a ray from screen point
         Ray ray = mainCamera.ScreenPointToRay(screenPos);
 
         float distance;
         if (aimPlane.Raycast(ray, out distance))
         {
             Debug.Log("Distance: " + distance);
             Vector3 hit = ray.GetPoint(distance);
             Debug.DrawLine(ray.GetPoint(0), hit, new Color(1, 1, 1));
 
             return hit;
         }
         else
         {
             Debug.DrawLine(ray.GetPoint(0), ray.GetPoint(50), new Color(1, 0, 0));
             Debug.LogError("Can't reach clickable plane.");
             return new Vector3(10, 10, 0);
         }
     }

I can see the debug Ray aiming at the plane, but it never hits.