Istraxx Shipment for Virtual Products - Product not registered message

[woodhouse]

Hi,
I purchased the extension and installed it.
I created the custom field and enetred the registration number.
When I try to add the custom field to a product there is a message telling that the product is not registered.
I even reset the domain name, entered the registration key again, but the message is still there.
I opened a ticket on the product support page, but I did not received any answer yet.
Do someone have a suggestion?
Thank you