Use the "Microsoft-Windows-Shell-Setup" aspect within the Windows System Image Manager (SIM) device to generate the precise segment in your autounattend.Xml file.
Specifically, you'll want to configure the subsequent settings:
In the "Microsoft-Windows-Shell-Setup" factor
Under the "OOBE" (Out-of-Box Experience) phase
Set "SkipMachineOOBE" to "true"
Set "SkipUserOOBE" to "genuine"
These settings will skip the Out-of-Box Experience, which incorporates the Microsoft account sign-in display screen.