Machine not shutdown during OffPeak hours.
Set "session idle timer" and "session idle timer interval" policies to trigger logoff after disconnection. Power management policy will apply if no session runs on desktop.
Session still exists on desktop so power management policy did not trigger shutdown behavior.
For both random and static desktop, power management policy only apply when there is no session on the desktop.
For static desktop, machine will shutdown at non-peak hours and start at peak hours (if no session run on the machine), regardless of the Buffer Size Percent.