cant see markers in rviz2

edit

Hi all. I am using ros2 foxy. I am trying to publish a marker to rviz, but it does not visualize it.

the marker code:

   visualization_msgs::msg::Marker marker;
   marker.id = 0;
   marker.header.frame_id = "base_link";
   marker.frame_locked = true;
   marker.header.stamp = this->get_clock()->now();
   marker.ns = "visual_box";

        marker.type = visualization_msgs::msg::Marker::CUBE;
        marker.action =visualization_msgs::msg::Marker::ADD;
        marker.pose=object_pos; 

        marker.scale.x = object_size.x/100.0f;
        marker.scale.y = object_size.y/100.0f;
        marker.scale.z = (object_size.z)/100.0f;
        marker.color.a = alpa; // Don't forget to set the alpha!

        marker.color.r = rand()%100/100.0f;
        marker.color.g = rand()%100/100.0f;
        marker.color.b = rand()%100/100.0f;

        this->box_marker_pub->publish(marker);

the msg is getting publish, if i echo it from the terminal i get:

picko@picko-koby:~/pickommerce_ws$ ros2 topic echo /packing_algorithm/visual_boxing
header:
  stamp:
    sec: 1666173251
    nanosec: 528962951
  frame_id: base_link
ns: visual_box
id: 0
type: 1
action: 0
pose:
  position:
    x: 0.555
    y: 0.555
    z: 0.5449999928474427
  orientation:
    x: 0.0
    y: 0.0
    z: 0.0
    w: 1.0
scale:
  x: 1.1100000143051147
  y: 1.1100000143051147
  z: 1.1100000143051147
color:
  r: 0.8299999833106995
  g: 0.8600000143051147
  b: 0.7699999809265137
  a: 0.5
lifetime:
  sec: 0
  nanosec: 0
frame_locked: true
points: []
colors: []
text: ''
mesh_resource: ''
mesh_use_embedded_materials: false
---

the fix frame in rviz set to base_link. any idea?