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I run into the same problem. In my case (Foxy on Windows 10), the solution was to set the variable QT_QPA_PLATFORM_PLUGIN_PATH to C:\dev\ros2_foxy\bin\platforms, the path to qwindows.dll delivered by ROS2. It was confusing since there is another qwindows.dll file under C:\Python38\Lib\site-packages\PyQt5\Qt\plugins\platforms as described by @Izsyvj.

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