DefaultEngine.ini settings not working

Can anyone tell me why my settings are not taking effect?

In my DefaultEngine.ini file I have


But in the editor after launching if I enter ‘r.VolumetricFog.TemporalReprojection’ in the Output Log the result is

r.VolumetricFog.TemporalReprojection =
“1” LastSetBy: Constructor

Also tried editing my ConsoleVariables.ini
Same issue.

So the answer is that the setting has to be under the right heading in your .ini file
In this case