So similar issue...my iPhone sits at "Security Recommendation" when testing this on my home network. I see the client in the list, I see the probe requests, but what isn't happening is the target client isn't either being allowed to connect or is not connecting to the internet.
So I followed the video directions for the Nano to perform MITM on my own network. I see NO clients in my list. I updated firmware, rebooted the nano, tried it all. Any assistance would be appreciated.