CSOM Create SubSite

#################################################
# VARIABLES A MODIFIER
#################################################
# Script variables
$targetWebUrl = "https://XXX.sharepoint.com/sites/templates"
$login = "XXX@XXX.fr"
$WebTitle = "My Project 8"
$WebRelativeUrl = "Prj8"

    #Web Template : {8B875C6B-137E-4BD3-A12A-83B2E0E58912}#TemplateDocumentsV1_0
    #Web Template : {DB2762F6-FE0D-4AE5-801D-B03F4705A0F8}#TemplateProjetV1_3
$WebTemplate = "{DB2762F6-FE0D-4AE5-801D-B03F4705A0F8}#TemplateProjetV1_3"

#################################################
# FIN DES VARIABLES A MODIFIER
#################################################


cls
$scriptFolder = "C:\Users\Thomas\Documents\00_Sources\SharePoint Scripts"
Set-Location $scriptFolder

Import-Module "../Microsoft.SharePoint.Client.dll"
Import-Module "../Microsoft.SharePoint.Client.Runtime.dll"


# SharePoint online credentials
$SecurePassword = Read-Host -Prompt "Enter password" -AsSecureString
$myCred = New-Object "Microsoft.SharePoint.Client.SharePointOnlineCredentials" -ArgumentList @($login, $SecurePassword)

$csomWebContext = New-Object "Microsoft.SharePoint.Client.ClientContext" -ArgumentList @($targetWebUrl)
$csomWebContext.Credentials = $myCred;
$ctx = $null

####################################################################
#
# FUNCTIONS
#
#####################################################################
function CreateWeb($Title, $RelativeUrl, $Description, $WebTemplate)
{
    $ctx.Load($ctx.Web.Webs)
    $ctx.ExecuteQuery()

    $createWeb =  New-Object Microsoft.SharePoint.Client.WebCreationInformation
    $createWeb.Url = $RelativeUrl
    $createWeb.Description = $Description
    $createWeb.UseSamePermissionsAsParentSite = $false
    $createWeb.Title = $Title
    $createWeb.WebTemplate = $WebTemplate
    $createWeb.Language = 1036

    $AddWeb = $ctx.Web.Webs.Add($createWeb)

    $ctx.Load($AddWeb)

    $ctx.ExecuteQuery()

    # Affectation des droits
    $roleAssignments = $AddWeb.RoleAssignments
    $ctx.Load($roleAssignments)
    $siteUsersWithTitle = $AddWeb.SiteUsers
    $ctx.Load($siteUsersWithTitle)
    $ctx.ExecuteQuery()

    $readerRole = $AddWeb.RoleDefinitions.GetByName("Lecture")
    $contribRole = $AddWeb.RoleDefinitions.GetByName("Modification")
    $adminRole = $AddWeb.RoleDefinitions.GetByName("Contrôle total")

    # Create role assignments
    $readerRoleAssignment = New-Object Microsoft.SharePoint.Client.RoleDefinitionBindingCollection($ctx)
    $readerRoleAssignment.Add($readerRole)
    $contribRoleAssignment = New-Object Microsoft.SharePoint.Client.RoleDefinitionBindingCollection($ctx)
    $contribRoleAssignment.Add($contribRole)
    $adminRoleAssignment = New-Object Microsoft.SharePoint.Client.RoleDefinitionBindingCollection($ctx)
    $adminRoleAssignment.Add($adminRole)

    # Créer les groupes
    $groupLecteursCI = New-Object Microsoft.SharePoint.Client.GroupCreationInformation
    $groupLecteursCI.Title = "Lecteurs $Title"
    $groupLecteurs = $AddWeb.SiteGroups.Add($groupLecteursCI)
    $groupMembresCI = New-Object Microsoft.SharePoint.Client.GroupCreationInformation
    $groupMembresCI.Title = "Membres $Title"
    $groupMembres = $AddWeb.SiteGroups.Add($groupMembresCI)
    $groupAdminCI = New-Object Microsoft.SharePoint.Client.GroupCreationInformation
    $groupAdminCI.Title = "Admins $Title"
    $groupAdmin = $AddWeb.SiteGroups.Add($groupAdminCI)


    # Apply the  permission roles to the list.
    $ctx.Load($AddWeb.RoleAssignments.Add($groupLecteurs, $readerRoleAssignment))
    $ctx.Load($AddWeb.RoleAssignments.Add($groupMembres, $contribRoleAssignment))
    $ctx.Load($AddWeb.RoleAssignments.Add($groupAdmin, $adminRoleAssignment))
    $AddWeb.Update()
    $ctx.ExecuteQuery()

    $AddWeb
}

####################################################################
#
# MAIN FLOW
#
#####################################################################
$web = $csomWebContext.Web
$csomWebContext.Load($web, $web.Title)

#$cTypes = $csomWebContext.Site.GetWebTemplates(1036, 0)
#$csomWebContext.Load($cTypes)

$csomWebContext.Load($web.Webs)
$csomWebContext.ExecuteQuery()

$web.Title

#foreach ($c in $cTypes)
#{
#    $c.Name
#    $c.Title
#}

"Create $WebTitle"

$ctx = $csomWebContext
# Création du Web :
$rootWeb = CreateWeb $WebTitle $WebRelativeUrl "Generated Web" $WebTemplate

$csomWebContext.Dispose();

"END"