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For some reason the apriltag_detector node is simply not detecting any tags, this is exactly the behaviour you would expect in this case. Here are a few things to check:
Is the correct camera image topic being published alongside the camera images? Are the camera topics correctly mapped to the topic names the detector node expects? Are the camera images well exposed, not noisy and reasonably in focus? Have the size and type of fiducial markers been setup for the detector node?
Also if you could add one of the camera images and info messages to your question then we could confirm that side of things is okay.
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