UserKey

Content.UserKey property

An alternative ID for the user identified in the UserId property. For example, this property is populated with the passport unique ID (PUID) for events performed by users in SharePoint, OneDrive for Business, and Exchange. This property may also specify the same value as the UserID property for events occurring in other services and events performed by system accounts. Mandatory: Yes

public string UserKey { get; set; }

See Also