@Jeff_R 

The MAC addresses of the original are likely changed to a different value. What should at least be the same is the first half of the original MAC address.

@Tony Thanks, but I'm not having a problem with not seeing the MAC addresses I expect, I'm not seeing the extended network clients up addresses in the router client list.  I thought that if the router handled the DHCP for the extender clients, they should all be on the same subnet and therefore visible to the rest of the network.

@Jeff_R 

If you were to use the Tether app or log into the extender directly, do you the clients listed there?

@Tony I can see the clients at the web interface and on the tether app.  Clients have internet access; they simply don't appear on the router client list and can't be accessed from other devices on the network not connected to the extender.