ZoHo CRM not showing ZoHo Desk Tickets

ZoHo CRM not showing ZoHo Desk Tickets

We have recently added ZoHo Desk and have mapped all fields and configured 2-way integration with Leads, Contacts and Accounts. There is now a ZoHo Desk section showing in ZoHo CRM for these modules, but they never show any ticket activity from ZoHo Desk. What other setting could be preventing the CRM from showing related ZoHo Desk tickets?

Kevin Tanner