Users are those with Webex hosting accounts within your organisation.Contacts are those that have been added in Webex Control Hub, e.g. people or devices from outside your organisation. They can be added by csv import in the 'Users' section on Contro...
Does everything look ok and online in your CUIC Data Sources tab?If not, check that all settings are correct and that the 'uccxhruser' is set correctly (password, etc) in the UCCX section.
