ROs1 publish Bbox2D vs ROS1 Camera Helper

Hi,
I am trying to get Bounding Box information from Isaac sim. When i use the camera helper node in action graph, i am able to get the image. However, when i select Bbox2D tight form the options, reload the scene and run the simulation, the rostopic is essentially empty. Image has been attached. I was wondering what is the purpose of ROS1 publish Bbox2d and how to use it? I want to get the bounding box coordinates, as well as the labels with it for my application.