Troubleshooting Tip: "FortiGuard OT Security Services" shows as unlicensed despite valid license purchase in HA environment.

From the GUI:

Navigate to System -> FortiGuard.

The entitlement for each device can be verified through the Fortinet Support Portal at support.fortinet.com. Navigate to Services -> Asset Management -> Product List to view the entitlement details.

For the primary device, the license has been successfully purchased and is correctly reflected in the support portal.


However, for the secondary device, the license has not been purchased.

As a result, the cluster reflects an unlicensed status. If any FortiGate in the cluster has a lower licensing tier, the entire cluster will operate at that lowest level. For example, if FortiGuard OT Security Service is licensed on only one FortiGate in the cluster, once the cluster is formed, FortiGuard OT Security Service will not be available on any of the cluster members.

Note: All FortiGate devices within a cluster must maintain the same licensing level.

Related documents:
How to update Operational Technology (OT) Security Service database signatures