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TLDR: Make sure the topic name that your are publishing is actually the name being subscribed to.

If this follows the tutorial exactly, then you probably just need to map your topics correctly. It sounds like RVIZ is subscribing to /move_group/monitored_planning_scene and your topic is publishing to planning_Scene

In your launch file of this c++ node you can remap the topic :

<remap from="planning_Scene" to="/move_group/monitored_planning_scene"/>

Or you can hardcode the RVIZ topic into the c++ node by replacing planning_Scene with /move_group/monitored_planning_scene where you define the publisher above.