"Remove the Action Center Icon" Group Policy setting requires Loopback Processing Mode Enabled?
There is a User Configurable policy in Admin Templates / Start Menu and Taskbar called Remove the Action Center Icon that is supposed to disable the Action Center Icon, and also prevent any notification bubbles from popping up. In trying to implement this we found that enabling this policy didn't actually have any effect, and the action center icon was still visiable, and we were still seeing popups.
In testing possible workarounds for this, we found the policy would be successful if we enabled Group Policy loopback mode (merge)
Can anybody explain why loopback processing mode is required for this policy setting?