When I place a Room Area it won’t calculate the volume, why is that?
It sounds like the settings to Area only.
Select Ribbon Architecture > Room & Area > Area and Volume Computations. You will need to select the little down arrow on Room & Area to select Area and Volume Computations.
On the Computations Tab Select ‘Areas and Volumes’, then press OK. If you select one of the areas it should now give you the volume