Bulk error -creating external contacts in Exchange O365

Hi,

I am trying to import 600 contact to the cloud using this command below :

Import-Csv .\ExternalContacts.csv|%{New-MailContact -Name $_.Name -DisplayName $_.Name -ExternalEmailAddress $_.ExternalEmailAddress -FirstName $_.FirstName -LastName $_.LastName

The CSV only contain these entries:
Name      FirstName  LastName      ExternalEmailAddress

I checked all the entries and there is not empty entries but when I run the command it saw this error at the end. Any idea will be appreciated!

Invoke-Command : Cannot bind parameter 'Name' to the target. Exception setting
"Name": "The property value is invalid. The value can't contain leading or trailing whitespace."
At C:\Users\Lilxx\AppData\Local\Temp\tmp_0b1a7f54-5061-47c5-84f9-0fada19f412f
_gdlhupqx.ux3\tmp_0b1a7f54-5061-47c5-84f9-0fada19f412f_gdlhupqx.ux3.psm1:23617
char:29
+             $scriptCmd = { & <<<<  $script:InvokeCommand `
    + CategoryInfo          : WriteError: (:) [New-MailContact], ParameterBind
   ingException
    + FullyQualifiedErrorId : ParameterBindingFailed,Microsoft.Exchange.Manage
   ment.RecipientTasks.NewMailContact

Thanks
Libet