从计算机sid获取计算机sid

我可以像下面这样获得机器Sid:

var objSid = dir.Children.Cast<DirectoryEntry>().First().InvokeGet("objectSID");
var secId = new SecurityIdentifier((byte[])objSid, 0);
var machineSid = secId.AccountDomainSid.ToString();

我尝试从计算机Sid中找到计算机Sid。但是始终为NULL。

using (PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, "AbcDomain", "userName", "password"))
{
    var pc01 = ComputerPrincipal.FindByIdentity(principalContext, IdentityType.Sid, machineSid);
    //output: pc01 = null
    var pc02 = ComputerPrincipal.FindByIdentity(principalContext, IdentityType.Name, "PC-JACKML5291");
    //output: pc02...

}

I want to check duplicate machine sid before call "JoinDomainOrWorkgroup".
Can I get the Computer SID (joined domain) from machine SID ?

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