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https://blog.it-kb.ru/2019/05/19/sharepoint-server-2016-errors-access-denied-and-object-reference-not-set-to-an-instance-of-an-object-when-creating-managed-account-with-automatic-password-change/
SharePoint Server 2016 : Ошибки "Access denied" и "Object reference not set to an instance of an object" при создании Managed Account с опцией Automatic Password Change