Do you see the additional network adapters in the GUI (Configuration -> Network Adapters)?
If not, please check the ESXi VM's configuration (.vmx) file to see what type of network adapters were created. For each of them you should see an entry
ethernetX.virtualDev = "e1000"
where "X" is the adapters number. If this entry doesn't exist for the additional network adapter, you may just add it for each of them.
André