Use FQDN hosts and host groups in all policies and services
Make the FQDN host and host group available in any required service and menu. We live in the DNA era, not in the Stone Age.
Anywhere a host entry can be configured should permit all host/group types.
For me specifically FQDN entries should be allowed in Device Access Local service ACL exception rules too.
Ronak Sheth commented
Allow us to create DoS Bypass Rule on FQDN and add description for each rule for future reference purpose.