OneDrive won’t open after a fresh Windows 11 install

After a fresh install of Windows 11 (usually noticed after installing Office), OneDrive won’t open. No sign-in window appears and there’s no OneDrive icon in the system tray.

Cause
The registry value DisableFileSyncNGSC is set to 1, which blocks OneDrive from starting.

Fix

1. Open Registry Editor (regedit) as an administrator.
2. Go to HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\OneDrive
3. Double-click DisableFileSyncNGSC and change the value from 1 to 0.
4. Open OneDrive from the Start menu and sign in.

Note
If the value changes back to 1, a policy is setting it. Escalate rather than changing it again.