Enrolling a device is required before the device can be managed by the Workspace ONE UEM powered by AirWatch. There are multiple enrollment paths, each path with options.
Enrolling Devices at Global
The Global organization group (OG) is designed to house Customer and other types of OGs. Given the way inheritance works, if you add devices to Global and configure Global with settings intended to affect those devices, you are also affecting all the Customer OGs underneath. This undermines the benefits of multitenancy and inheritance.
For more information, see Reasons You Should Not Enroll Devices in Global.