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I assume you are using it from this repo https://github.com/pal-robotics/aruco_ros If so, are you making sure the TF tree is set up properly? From their github I can see:

the frame in which the pose is refered to can be chosen with the 'ref_frame' argument. The next example forces the marker pose to be published with respect to the robot base_link frame:

And being lunched with:

roslaunch aruco_ros single.launch markerId:=26 markerSize:=0.08 eye:="right" ref_frame:=/base_link

So I'd check that first. Also some code or lunch command would be helpful for us to help you! best of luck!