You may notice an error message “Unable to create PHostingManager object:Unable to set current ip address: IP address is missing” in Plesk when trying to manage a domain from Domains >> domainname.tld. The error appears when an IP assigned to a domain is not assigned to the ‘Owner’ of the domain.
To fix the issue, go to
Plesk --> Click 'Settings' --> click "IP Addresses" --> click the number under the 'Users' coloumn in front of the IP address --> Assign the IP to the owner.
This will update the ‘psa’ database and allow the user to manage the domain from Plesk.