Powershell: Objekt wird nicht in CSV exportiert, sondern der Datentyp

function search-ldap {
    PARAM(

        $query = "(&(objectclass=posixaccount))",  
        $items = @("uid","sn","givenname","mail"),  
        $root = "LDAP://192.168.XXX.XXX/dc=domain,dc=de",  
        $outfile,
        $sort

    )
    
    $output = @()
        
    $auth = [System.DirectoryServices.AuthenticationTypes]::Anonymous
    $de = New-Object System.DirectoryServices.DirectoryEntry($root,$null,$null,$auth)
    $search = New-Object system.DirectoryServices.DirectorySearcher($de,$query)
    $result = $search.FindAll()
  
    foreach($user in $result) {

        $data = ""  
        $data = New-Object PSObject
        foreach($item in $items) {
    
            $data | Add-Member NoteProperty $item $user.Properties.Item($item)

        }
  
        $output += $data
    }

    if($sort) {
    
        $output = $output | Sort-Object -property $sort
        
    }

    if($outfile) {

        export-csv -inputobject $output -path $outfile -delimiter ";" -NoTypeInformation -encoding UTF8  -force  

    }
 
    return $output

}

uid                              sn                                givenname                  mail
---                              --                                ---------                  ----
{vname}                    { name}                     {vorname}                    {vorname.name@domain.de}

"uid";"sn";"givenname";"mail"  
"System.DirectoryServices.ResultPropertyValueCollection";"System.DirectoryServices.ResultPropertyValueCollection";"System.DirectoryServices.ResultPropertyValueCollection";"System.DirectoryServices.ResultPropertyValueCollection"