A FortiCloud account can only have one EMS trial license. You must have an eligible FortiCloud account to activate an EMS trial license. See To apply a trial license to FortiClient EMS. EMS consumes one license count for each managed endpoint. The trial license includes the same functionality as the Zero Trust Network Access license and does not include Sandbox Cloud support. With the free trial license, you can provision and manage FortiClient on three Windows, macOS, Linux, iOS, and Android endpoints and three Chromebooks indefinitely.
After you install EMS, you can enable a free trial license.