The answer to your question about scanner IP address is described in the link provided by @cfi :
OPENVAS SCAN - GOS Manual: 9.3.3 Requirements on Target Systems with Microsoft Windows.
Generated install package for credentials: During the installation, the installer offers a dialog to enter the appliance’s IP address. If the entry is confirmed, the firewall rule is configured. The service File and Printer Sharing will be enabled in the firewall rules.
Furthermore authenticated scans will not work without openvas-smb since SMB is the session layer protocol used for communication with Windows targets. If Kali is not packaging openvas-smb you can submit a bug to the Kali Bug Tracker.
However, in the case you are attempting to use Kerberos over SMB you can also refer the conversation here, since Kerberos credentials are not enabled by default in the Community Edition of products.