If Windows 11 update and restart are not working, it's probably a missing update file so reset the Windows Update components ...

Every now and then, most especially, a system administrator will need to restart a server or system. Usually, you can Remote Shut down or Restart Windows through the graphical user interface ...

Emergency Restart or Shutdown Windows Soft Reboot vs Hard Reboot vs Restart vs Reset Force Windows full shutdown to reinitialize it How to Stop, Cancel, Abort System Shutdown in Windows.