Problem

When Return Form (Beilegeretoure) is enabled in Magento, the following error occurs when trying to create labels:


"hard validation error occured. | der angegebene service ist nicht bekannt."


If Return Form is disabled, the label can be created normally.


Cause

Most likely, this is a misconfiguration in the DHL account, i.e. Return Shipments are not activated at DHL.


Solution

Contact the DHL team and ask them to check and correct the settings in your DHL account.