NX Export from NX Active Workspace fails

Error raised in syslog "Invalid value of unmanaged offline site in preference 'AWN0NX_nx_unmanaged_site'."

Preference AWN0NX_NX_UnmanagedSite need to be set.
Documentation included in AW 5.2.

https://docs.sw.siemens.com/documentation/external/PL20210210135253554/en-US/refs/AdminDataReport/Preferences/Fnd0PreferenceDefinition_AWN0NX_NX_UnmanagedSite_AWN0NX_NX_UnmanagedSite.html 

Preference : AWN0NX_NX_UnmanagedSitePreferences are a mechanism to define and control behavior in Teamcenter.

PropertiesName:AWN0NX_NX_UnmanagedSite

Description:Defines the name of unmanaged offline site for Export NX Data.Preference Category:

Active WorkspaceData Type:String
Is Environment Enabled:N
Protection Scope:Site
Is Array:N
Overrides:Location Name