Isaac Ros April Tags no detections in sim or with usb camera

Looking for some pointers. following this quickstart tutorial for isaac-ros-apriltags: isaac_ros_apriltag — isaac_ros_docs documentation

Everything is running, but there are no detections being `.
printed out by “ros2 topic echo /tag_detections”. Messages are flowing, and I can see them scrolling past the screen, but the detections array is empty:

"header:
stamp:
sec: 333
nanosec: 716684071
frame_id: carter_camera_stereo_left
detections:

header:
stamp:
sec: 333
nanosec: 733350738
frame_id: carter_camera_stereo_left
detections:

"

Nothing in the log file either:
1714701602.6129422 [INFO] [launch]: All log files can be found below /home/admin/.ros/log/2024-05-02-19-00-02-609458-wmap-849
1714701602.6134381 [INFO] [launch]: Default logging verbosity is set to INFO
1714701602.7898903 [INFO] [component_container_mt-1]: process started with pid [860]
1714701603.2534029 [INFO] [launch_ros.actions.load_composable_nodes]: Loaded node ‘/apriltag’ in container ‘/apriltag_container’

I’m stumped. Any pointers? Also I run this usb camera tutorial Tutorial for AprilTag Detection with a USB Camera — isaac_ros_docs documentation and I can’t get any detections to show up. I’m using the 36H11 family.

any help is greatly appreciated!

@cgpadwick i am just a passerby and was wondering if you are using Isaac Sim ver 2023.1.1?