If you have previously installed the connectd package on your Pi, remove it, including all provisioning (configuration) files with the following command:
sudo dpkg --purge connectd
Now, install the connectd package following these instructions.
Copy and save the Bulk Identification Code.
Back on the Products page, click on the icon in the row corresponding to your desired Product Definition to select the Bulk Identification Code, save it and prepare to write it on the device to prepare the master SD card (later in this document).
sudo vi /etc/connectd/oem_settings
Change the expression for system ID like … cpuid=$(hostname) (OEM example)
Change the registration key method to use … interface='enp3s0' (Ubuntu example)
Please contact email@example.com if you are not sure what to do here.