The Error 004 may indicate various problems with the GLS WebAPI connection. It is important that you check the exact description in the error message. In order to be able to help you, we need the complete error message. Please contact us directly via the Support form in GLS easyConnect to our support team.
Possible causes could be
Field 'Street1' not valid: The street field 'Street1' may contain a maximum of 40 characters. Check whether, for example, the company name has also been entered and adjust the field manually.
Impermissible product/service combination: The selected combination of product and service is not permitted (e.g. Guaranteed24 + FlexDeliveryService). Adjust the service to a permissible combination.