Question Doublons générés lors du traitement import AD

$SAM.SubString(0, [Math]::Min(19, $SAM.length)) -replace '[^a-z A-Z 0-9]+','' -replace '[ ]',''

$SAM = $SAM.SubString(0, [Math]::Min(19, $SAM.length)) -replace '[^a-z A-Z 0-9]+','' -replace '[ ]',''

$users = import-csv -path "C:\Users\Administrateur\Desktop\importusers.csv" -delimiter ";"
$AD_SAM = get-ADuser -filter * -SearchBase "DC=Mondomaine,DC=local" | Select-Object -ExpandProperty SamAccountName
$NewUsers = $users | ForEach-Object {
    $sn = $_.Nom -replace '[^a-z0-9]+', ''
    $givenname = $_.Prenom -replace '[^a-z0-9]+', ''
    $Classe = $_.Classe
    $identifiant = $_.identifiant
    $ou = "OU=importusers,DC=Mondomaine,DC=local"
    $description = 'GCU-ORG{$ELEVE}$' + $Classe
    $SAM = $givenname.Substring(0,1).ToLower() + $sn.ToLower()
    
    $SAM = $SAM -replace '[^a-z A-Z 0-9]+','' -replace '[ ]',''
    if ($AD_SAM -contains $SAM)
    {
        for ($i = 1 ; ; $i++)
        {
            $SAMtmp = $SAM.SubString(0, [Math]::Min(19 - $i.ToString().Length, $SAM.length)) + $i.ToString()

            if ($AD_SAM -notcontains $SAMtmp)
            {
                $SAM = $SAMtmp
                break
            }
        }
    }
    $AD_SAM += $SAM

    $CN = $sn + " " + $givenname + " " + "[$identifiant]"
    $displayName = $CN
    $UPN = $SAM + "@Mondomaine.local"
    $userAccountControl = 66050
    $CannotChangePassword = 1
    $HomeDrive = "U"
    $HomeDirectory = "\\test\test"
    $ProfilePath = "C:\users"
    $ScriptLogon = "test"
    $Password = '{0}{1}' -f (get-random -Minimum 1000000 -Maximum 9999999), [char](get-random -Minimum 65 -Maximum 90)
    $Password = $Password -replace '0',(Get-Random -Minimum 1 -Maximum 9) -replace 'O',[char](get-Random -Minimum 65 -Maximum 78)
    $Secure_String_pwd = ConvertTo-SecureString $Password -AsPlainText -Force
    $Enabled = 1
    
New-ADuser -displayName $displayName -Path $ou -Description $description -SamAccountName $SAM -givenname $givenname -Surname $sn -name $displayName -UserPrincipalName $UPN -PasswordNeverExpires $userAccountControl -CannotChangePassword $CannotChangePassword -HomeDrive $HomeDrive -HomeDirectory $HomeDirectory -ProfilePath $ProfilePath -ScriptPath $ScriptLogon -Enabled $Enabled -Accountpassword $Secure_String_pwd

[PSCustomObject]@{
    Nom = $sn
    Prenom = $givenname
    OU = $ou
    Description= $description
    Login = $SAM
    Lettre_lecteur = $HomeDrive
    Dossier_personnel = $HomeDirectory
    Chemin_profil = $ProfilePath
    ScriptLogon = $ScriptLogon
    Mot_de_passe = $Password
    }
}
$NewUsers | Export-Csv -path "C:\Users\Administrateur\Desktop\export.csv" -Append -NoTypeInformation -Delimiter ";"