Alert Variables Not Working As Expected

Not sure what is wrong here.    Updated the email message text and now the substitions aren't working as expected.  This is the text of the email:

SUBJECT:

Alert: ${NodeName} Has An Interface Down

MESSAGE:

Interface ${N=SwisEntity;M=InterfaceName} is ${N=SwisEntity;M=Status;F=Status}

Node Details:

    Node Name:  ${NodeName}

    Model:  ${N=SwisEntity;M=MachineType}

    IP Address:  ${IP_Address}

    IOS Version:  ${IOSVersion}

    Last Reboot:  ${LastBoot}

Interface Details:

    Name:  ${N=SwisEntity;M=InterfaceName}

    If Name:  ${N=SwisEntity;M=IfName}

    Alias:  ${N=SwisEntity;M=Alias}

    Interface Description:  {N=SwisEntity;M=FCPort.InterfaceCaption}

    Carrier: ${N=SwisEntity;M=CustomProperties.CarrierName}

In the actual email that is sent, some substitutions are work, others are not.  Here is a sample:

SUBJECT:

Alert: MyNodeName Has An Interface Down

MESSAGE:

Node Details:

     Node Name:   MyNodeName

     Model:  ${N=SwisEntity;M=MachineType}

    IP Address:  ${IP_Address}

     IOS Version:  ${IOSVersion}

     Last Reboot:  ${LastBoot}

Interface Details:

     Name:  GigabitEthernet0/0

     If Name:  Gi0/0

     Alias:  MyNode LAN

     Interface Description: {N=SwisEntity;M=FCPort.InterfaceCaption}

     Carrier: 

Ideas oh why those lines in bold aren't resolving the variables?