@Djordje Novakovic Thanks for posting in our Q&A.
Please understand that intune just deploy the policy and it will not control where the device gets windows updates from. It means that if the device originally got updates from WSUS, it still gets updates from WSUS.
We can run the following command in PowerShell to confirm where the device gets updates from:
$MUSM = New-Object -ComObject "Microsoft.Update.ServiceManager"
$MUSM.Services | select Name, IsDefaultAUService
Hope the above information will help.
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