trying to work post processing with c++ and i cannot see the effects

Development Rendering
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void ABOTRODS_V1Pawn::SetPostProcessingActive(bool isActive)
{
if(isActive){
Camera->PostProcessSettings.MotionBlurAmount = 1;
Camera->PostProcessSettings.MotionBlurMax = 60;
Camera->PostProcessSettings.MotionBlurPerObjectSize =60;
}

	else {
		Camera->PostProcessSettings.MotionBlurAmount = 0;
		Camera->PostProcessSettings.MotionBlurMax = 0;
		Camera->PostProcessSettings.MotionBlurPerObjectSize = 0;
		Camera->FieldOfView = 90.f;
	}

}

is my approach wrong or something else i don’t understand but cannot see the effects in the camera and code works completely fine