PowerScript Impossible to create a Taxonomy session (CSOM)

Hi,

I'm using PowerScript, PowerShell and SharePoint Online Management Shell (used with admin rights).
I'm trying to use that code to insert new enterprise keywords in my library Documents:

Code:

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cls
 
#Your SharwPoint online Credentials
$siteUrl = "<My site>"
$username = "<My username>"
[string]$pwd = "<My pwd>"
$password = $pwd | ConvertTo-SecureString -AsPlainText -Force
$listName = "Documents";
$taxonomyField = "Enterprise Keywords"
 
# Load the Client object Model Assemblies
 
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Taxonomy")
 
function getContext()
{
    $context = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl)
    $credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password)
    $context.Credentials = $credentials
 
    return $context;
}
$context = getContext;
 
# load the List
$mainList = $context.Web.Lists.GetByTitle($listName);
$context.Load($mainList);
$context.ExecuteQuery();
 
# load the Taxonomy Field
$TaxonomyKategorieFld = $mainList.Fields.GetByInternalNameOrTitle($taxonomyField)
$context.Load($TaxonomyKategorieFld)
$context.ExecuteQuery();
 
# Create the item object in the Taxonomy List
$itemCreationInfo = New-Object Microsoft.SharePoint.Client.ListItemCreationInformation;
$item = $mainList.AddItem($itemCreationInfo);
$item.set_item("Title","Test Taxonomy Item");
$item.Update();
 
# Create Taxonomy Session
$sTaxonomySession = [Microsoft.SharePoint.Client.Taxonomy.TaxonomySession]::GetTaxonomySession($context);
$sTaxonomySession.UpdateCache();
$context.Load($sTaxonomySession);
$context.ExecuteQuery();
 
# Load Default Term Store (Site Settings --> Term Store Management)
$sTermStore = $sTaxonomySession.GetDefaultSiteCollectionTermStore();
$context.Load($sTermStore);
$context.ExecuteQuery();
 
 
if($sTermStore.IsOnline)
{
    $sGroup = $sTermStore.Groups.GetByName($sGroupName); # Get the Term Group
    $sTermSet = $sGroup.TermSets.GetByName($tsName); # Get the Term Set
    $context.Load($sTermSet);   
    $context.ExecuteQuery();
    $terms = $sTermSet.GetAllTerms(); # Load all the Terms in the TermSet
    $context.Load($terms);
    $context.ExecuteQuery();
 
    $txField = [Microsoft.SharePoint.Client.ClientContext].GetMethod("CastTo").
 
 
 
MakeGenericMethod([Microsoft.SharePoint.Client.Taxonomy.TaxonomyField]).    
    Invoke($context, $TaxonomyKategorieFld)   
    $termQuery = "Kunden";
    $termQuery1 = "Acme";
    $termValues = @();
    foreach($term in $terms)
    {
        # When Kunden or Aceme Terms found, add to the Taxonomy Field
        if(($term.Name -eq $termQuery) -or ($term.Name -eq $termQuery1))
        {
            $termValues +=  "-1;#" + $term.Name + "|" + $term.Id;
            $termValuesString = $termValues -join ";#"
        }   
    }   
 
    $termValues = new-object Microsoft.SharePoint.Client.Taxonomy.TaxonomyFieldValueCollection($context, $termValuesString, $txField)
    $txField.SetFieldValueByValueCollection($item, $termValues);
    $item.Update();
    $context.Load($item);
    $context.ExecuteQuery();
}
 
$context = $null;
Read-Host "Press a key to exit..."

But I get the following error:

Code:

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Unable to find type [Microsoft.SharePoint.Client.Taxonomy.TaxonomySession].
At C:\users\9206513E\Desktop\test.ps1:56 char 21
+ ... mySession = [Microsoft.SharePoint.Client.Taxonomy.TaxonomySession]::G ...
+                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : Invoke MethodOnNull

Do you have any idea why this datatype in particular does not exists?

Thanks a lot!

Jean