Four possibilities here. Starting with SP3 a new dial was introduced on the light properties. This dial gives individual control over the light atmospheric effect. The default setting for this dial is zero or no effect. Set it to 1.000
The Volume density may be set to low in the material setup. 0.01 is a good starting point.
You have to use the Fire Fly render. The P4 render engine doesn't do volume, sorry.
There must be something behind the figures for the volume to show up. A prop Square scaled to fill the window will work.
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