This issue related to the license has been renew but still does not reflect even after passing the expiry date. This article describes how to fix this issue.
Make sure to allow the traffic towards usfds1.fortinet.com on TCP port 443.
Also note that the respective traffic should not be deep inspected because fortiguard servers must see fortianalyzers certificate.
Once the traffic is allowed, trigger a manual update with the following command:
# diag fmupdate updatenow fds
If the issue is still occuring, check the connection with FDS as below commands and share results with TAC.
# diagnose license list # diagnose fmupdate dbcontract # diag fmupdate view-serverlist fds # diag fmupdate view-service-info fds # diag fmupdate update-status fds # diag fmupdate get-device fds