Client Does not move into Preferred Group after installing SEP

Hi,

I've created a Linux Installation Package and specify the client group to My Company\LINUX

but when I installed the package to the client, all clients then were placed in My Company not My Company\LINUX.

here is a snippet of the generated sylink.xml inside the installer package:

<AgentCommunicationSetting AlwaysConnect="1" CommunicationMode="PUSH" DisableDownloadProfile="0" Kcs="E2A621D5FE015CC9587B78B103806FB6" PushHeartbeatSeconds="300" UploadCmdStateHeartbeatSeconds="300" UploadLearnedApp="0" UploadLogHeartbeatSeconds="300" UploadOpStateHeartbeatSeconds="300"/>
    <LogSetting MaxLogRecords="100" SendingLogAllowed="1" UploadProcessLog="1" UploadRawLog="1" UploadSecurityLog="1" UploadSystemLog="1" UploadTrafficLog="1"/>
    <RegisterClient PreferredGroup="My Company\LINUX" PreferredMode="0"/>
    <ServerList FreezeSmsList="0" Name="Default Management Server List for My Site">
      <ServerPriorityBlock Name="List0">
        <Server Address="192.168.27.79" HttpsPort="443" Protocol="HTTPS" VerifySignatures="1"/>
        <Server Address="SEE" HttpsPort="443" Protocol="HTTPS" VerifySignatures="1"/>
        <Server Address="SEE.lab212.com" HttpsPort="443" Protocol="HTTPS" VerifySignatures="1"/>
      </ServerPriorityBlock>
    </ServerList>