Hi all this is FYI
Problem
If you are using the Workflow "Clone, Linux with multipe NICs" you need to SET the nic type else it adds new NICs with Flex and they are not supported in RHEL7 and the OS wont pick them up.
The problem is in the Workflow "Get multipe VirtualEthernetCard Device Changes". The input stiulates that tyou can define the type, however if a new card is build it uses the Action "getVirtualPCNet32" which creates an Flex card.
You can see that when you run the workflow and edit the VM hardware.
Solution
You need to replace the action "getVirtualPCNet32" with the action "getVirtualVmxnet3" in the Workflow "Get multipe VirtualEthernetCard Device Changes"