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Maybe the octomap server build the map but you juste don't see it. To see the 3D map, you have to subscribe (under RVIZ) to the topic :

occupied_cells_vis_array (visualization_msgs/MarkerArray)

or, if you prefer a pointCloud :

octomap_point_cloud_centers (sensor_msgs/PointCloud2)

If you don't see anything in these topics, try to vizualise if the input pointcloud of octomap is ok.

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