Event ID - 251

Event Id251
DescriptionUnable to create a Windows NT account for user XXX (where XXX is the user specified in the .CSV file).
Event InformationAccording to Microsoft:
If you import a file that matches one of the two situations above, the Create Windows NT Account option should be turned off before running import.
Reference LinksXADM: Bulk Import Fails to Create WinNT Accounts for Users

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