Can you please let us know where are getting "IP address not found" massages ? Are you able to see your IP in Plesk >>Tools & Settings>>IP addresses management ?
basically i am on hosting.com and i want to migrate my data to media temple. The error is showed in migration tool when i enter server ip and password.
Cpanel TO Plesk
Solved i have switched my source server ip to shared, from WHM (Basic cPanel & WHM Setup)
Source server Shared IP will serve with destination server Shared IP