If you're entering licenses into UPM's license management interface, you won't be able to successfully use these licenses until the add-on consumes UPM's licensing API. Until this work is done, UPM will accept the license and report it as valid but the add-on will not work. This means you can e.g. get the error message "Errir rendering SharePoint list macro - The Legacy SharePoint Connector for Confluence requires a valid license."
One more thing -- please note that all Legacy SharePoint Connector license keys are compatible with either license field. This means that all add-on license keys can be entered in either field, even though the impact of those two fields differ.