When I attempted to log in remotely to a Windows 10 system that is a member of a Server 2012 Windows domain using a domain account, I saw the message "The connection was denied because the user account is not authorized for remote login." The problem can be resolved by logging into the system remotely using a domain administrator account and adding the accounts for which you wish to grant remote logon access to the Remote Desktop Users group through the Control Panel by selecting System and Security, Administrative Tools, and Computer Management.
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