O nome da conta do usuário não pode ser resolvido no Active Directory. É necessário verificar se o usuário é real ou apenas um objeto usuário temporário gerado para fins do aplicativo. Talvez você possa refinar o filtro de pesquisa do LDAP para evitar esse erro.

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The user account name can not be resolved within the Active Directory. You would need to verify whether the user is a real user or just a temporary user object generated for some application purpose. You might be able to refine the LDAP search filter to avoid this error.

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