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Hi,
When a new domain user or group account is created, AD assigns the new object a globally unique identifier (GUID), which is a 128-bit value that is unique not only in the enterprise but also across the world. GUIDs are assigned to every object created by Active Directory, not just User and Group objects. Each object's GUID is stored in its Object-GUID (objectGUID) property.
The Object-GUID never changes. When an object is assigned a GUID, it keeps that value for life.
For more information you can refer to the following link:
Best Regards,