Hi,
Have you configured the "lways automatically restart at the scheduled time" in the group policy? If no, please try to configure it.
The full path of this policy is:
Computer Configuration\Administrative Templates\Windows Components\Windows Update\Always automatically restart at the scheduled time
Best Regards.
Steven Lee Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.