Depthcloud not working?

[Webassign001]

I am using UE4.26 and simply placed the VisionActor into the level. I got color image, depth image, and TF in Rviz, but I can't get the depth cloud to show in the Rviz like in the readme. I don't know what I am missing here.

[Webassign001]

The data from /unreal_ros/image_depth also made zero sense, I tried to convert the data into floats for distance map, it gave me 1e-5 values, it does change if the object in front of it moves closer/further, but the amount changed makes no sense and was not proportional to the object movement.