Even if the check of your access data to the business customer portal has been completed successfully, the following error may occur when creating shipping labels:
"Fehler: 1001 Der Nutzer des Webservice konnte nicht authentifiziert werden." (Error: 1001 The user of the web service could not be authenticated.)
This error may occur if your username or password contains certain characters. Change your username and/or password or contact DHL to resolve the problem.