To manually assign sensors to a policy (Not using sensor or asset groups to group sensors by policy) this parameter may be used.
To automatically assign sensors to a specific policy (Using sensor or asset groups to group sensors by policy) this parameter should not be used.
Setting this parameter will cause the sensor to register as "manually assigned", causing auto-assignment to fail.
Additional Information
GROUP_NAME=value in an unattended sensor installation is not related to sensor groups, rather an optional policy name assignment. This will manually assign a sensor to a policy, not a group. If the sensor is manually assigned to a policy, it is impossible to assign it a group.
It is recommended to have specific policy configured for non-persistent VDI devices.
Assigning VDIs to a group is not required, but can be useful for sorting the endpoints page.