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It's hard to parse your last sentence. I guess you were able to display an image. In this case, I do think it is the lack of tf data, as the pointcloud data needs a coordinate frame, while the image does not.

In this case you need to manually set rviz to the right frame. Check the output of rostopic echo /stereo_camera/pointclouds2/header/frame_id and set the according frame name as fixed_frame in rviz.