Unattended (Answer File)

I used this file to change few things like timezone, dark theme, locale

unattend.xml

<?xml version="1.0" encoding="utf-8"?>
<unattend xmlns="urn:schemas-microsoft-com:unattend">
    <settings pass="windowsPE">
        <component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State">
            <ComplianceCheck>
                <DisplayReport>OnError</DisplayReport>
            </ComplianceCheck>
            <UserData>
                <AcceptEula>true</AcceptEula>
                <ProductKey>
                    <Key></Key>
                </ProductKey>
            </UserData>
        </component>
        <component name="Microsoft-Windows-International-Core-WinPE" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <SetupUILanguage>
                <UILanguage>en-US</UILanguage>
            </SetupUILanguage>
            <InputLocale>0409:00000409</InputLocale>
            <SystemLocale>en-US</SystemLocale>
            <UILanguage>en-US</UILanguage>
            <UserLocale>el-GR</UserLocale>
        </component>
    </settings>
    <settings pass="specialize">
        <component name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State">
            <RegisteredOrganization>Company</RegisteredOrganization>
            <RegisteredOwner>Company</RegisteredOwner>
            <DoNotCleanTaskBar>true</DoNotCleanTaskBar>
            <TimeZone>GTB Standard Time</TimeZone>
            <ConfigureChatAutoInstall>false</ConfigureChatAutoInstall>
            <Themes>
                <DefaultThemesOff>false</DefaultThemesOff>
                <DesktopBackground>C:\Windows\Web\4k\Wallpaper\Windows\img0_3840x2160.jpg</DesktopBackground>
                <SystemUsesLightTheme>false</SystemUsesLightTheme>
                <ThemeName>Cube</ThemeName>
                <UWPAppsUseLightTheme>false</UWPAppsUseLightTheme>
                <WindowColor>0x2efddb</WindowColor>
            </Themes>
        </component>
        <component name="Microsoft-Windows-IE-InternetExplorer" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <Home_Page>https://company.com</Home_Page>
        </component>
        <component name="Microsoft-Windows-Deployment" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <RunSynchronous>
                <RunSynchronousCommand wcm:action="add">
                    <Description>EnableAdmin</Description>
                    <Order>1</Order>
                    <Path>cmd /c net user Administrator /active:yes</Path>
                </RunSynchronousCommand>
                <RunSynchronousCommand wcm:action="add">
                    <Description>UnfilterAdministratorToken</Description>
                    <Order>2</Order>
                    <Path>cmd /c reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v FilterAdministratorToken /t REG_DWORD /d 0 /f</Path>
                </RunSynchronousCommand>
                <RunSynchronousCommand wcm:action="add">
                    <Description>disable user account page</Description>
                    <Order>3</Order>
                    <Path>reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Setup\OOBE /v UnattendCreatedUser /t REG_DWORD /d 1 /f</Path>
                </RunSynchronousCommand>
                <RunSynchronousCommand wcm:action="add">
                    <Description>disable async RunOnce</Description>
                    <Order>4</Order>
                    <Path>reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer /v AsyncRunOnce /t REG_DWORD /d 0 /f</Path>
                </RunSynchronousCommand>
            </RunSynchronous>
        </component>
        <component name="Microsoft-Windows-International-Core" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <InputLocale>0409:00000409</InputLocale>
            <SystemLocale>en-US</SystemLocale>
            <UILanguage>en-US</UILanguage>
            <UserLocale>el-GR</UserLocale>
        </component>
        <component name="Microsoft-Windows-SystemRestore-Main" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <DisableSR>1</DisableSR>
        </component>
    </settings>
    <settings pass="oobeSystem">
        <component name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State">
            <UserAccounts>
                <AdministratorPassword>
                    <Value></Value>
                    <PlainText>true</PlainText>
                </AdministratorPassword>
            </UserAccounts>
            <AutoLogon>
                <Enabled>true</Enabled>
                <Username>Administrator</Username>
                <Domain>.</Domain>
                <Password>
                    <Value></Value>
                    <PlainText>true</PlainText>
                </Password>
                <LogonCount>999</LogonCount>
            </AutoLogon>
            <OOBE>
                <HideEULAPage>true</HideEULAPage>
                <NetworkLocation>Work</NetworkLocation>
                <ProtectYourPC>1</ProtectYourPC>
                <HideLocalAccountScreen>true</HideLocalAccountScreen>
                <HideOnlineAccountScreens>true</HideOnlineAccountScreens>
                <HideWirelessSetupInOOBE>true</HideWirelessSetupInOOBE>
            </OOBE>
        </component>
        <component name="Microsoft-Windows-International-Core" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <InputLocale>0409:00000409</InputLocale>
            <SystemLocale>en-US</SystemLocale>
            <UILanguage>en-US</UILanguage>
            <UserLocale>el-GR</UserLocale>
        </component>
    </settings>
    <cpi:offlineImage cpi:source="wim:c:/osdbuilder/osmedia/windows%2011%20pro%20n%20x64%2021h2%2022000.856/os/sources/install.wim#Windows 10 Pro N" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
</unattend>

Place it in OSBuilder/Content/Unattend Create Task with:

New-OSBuildTask -TaskName 'Unattend-GroupMachine1' -CustomName 'MyCustomName' -ContentUnattend