That sounds more like a server configuration error. You can have multiple IP addresses on a server but only one can be bound for the actual license part if you read up on the link that Peter provided.
But I would suggest that you double check your settings in Plesk and on the server itself. Once all is configured and done for, reach out to the Plesk sales team providing them with the bounded IP address that is going to be used as a means of verifying the license.