A reboot has been scheduled (Windows Update) – Rescheduling the reboot time does not work

Cumulative Update for Windows 10 version 1511 for x64 systems requires a reboot to complete the installation. By default, the reboot has been scheduled for when I am not using the device. So I decided to reschedule the reboot to a more convenient time by selecting the reboot time. But when the computer reaches the scheduled time, no reboot takes place.
Option 1: We will schedule a reboot for a time when you do not normally use your device.
Option 2: Select a restart time.
Note: Option 2 doesn't work, but I can restart manually now.

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