Windows 10 Updates DualScan disabled and SCCM SUP/WSUS managed

Let’s double check that!

To check if dualscan is disabled. Simple run the following PowerShell commands on your target machines.

$MUSM = New-Object -ComObject "Microsoft.Update.ServiceManager"
$MUSM.Services | select Name, IsDefaultAUService

Verify that DefaultAUService is WSUS. Also make sure that you have the following reg key set to 1.
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\
DisableDualScan REG_DWORD 1