Post process volume not work playing in editor?

Hi so i am in 4.26 and with day / night cycle there is a capture based skylight that will light underground caves or rooms during the day. So i put a post process volume around , say the underground room for example. I dim the exposure to darken it accordingly , and if not playing in the editor , and i just move the camera outside and into the room , the room darkens like it is set as the camera crosses in and out of the volume . But if i click " play from here " outside , then walk into the volume with the player , the light does not dim when i walk into the volume. Is there something i’m missing?