Account Creation Status: failed. Your system has run out of available ip addresses, or you do not have permission to use any more ip addresses.
Above error normally is due to packages added on the server .
Please check the package assigned for the domains, the package added might be by default created with dedicated IP.
To resolve the issue remove the package and recreate the package with Dedicated IP option deselected .
Now try adding an account from WHM with defined package. It should be added now.