My understanding is that under your scenario the client is deregistered
after 14 days of inactivity but the license is not released yet. If the
user re-registers during the subsequent 14 days, the original license
will be reapplied. However, if they ...
Take a look at System Settings -> Endpoint Settings
https://docs.fortinet.com/document/forticlient/7.2.1/ems-administration-guide/319002/configuring-ems-settings
A quick heads up that in FortiClient EMS 7.0.2 you can automate this
task, if desired, by configuring the number of days after the endpoint
last contacted EMS to DeRegister the Endpoint and then configure the
number of days after the endpoint was der...