Windows 10 users are reporting being affected by a bug that prevents them from shutting down their devices without logging out first. Windows 7 users started reporting encountering “You don t have permission to shut down this computer”” errors on February 6. Microsoft hasn’t yet acknowledged this as a known issue on the Windows Health Dashboards for Windows 10 or Windows 7. Microsoft also pulled the standalone KB4524244 security update from Windows Update over the weekend after confirming previous user reports about freezes
Source: February 17, 2020