I have a mix of deco units (10 total). There are (3) XE5300, (3) X3600, (3) M9 plus and (1)  X-50 outdoor unit.

These units are also mostly hardwired for ethernet backhaul to unmanged network switches all on the same network. 

I am trying to add devices to the IoT network but whenever I enable the IoT network feature and connect devices to the IoT network, It connects to it but the devices say no internet available and no internet connection is there.

I have tested each deco unit by connecting a ethernet cable to a port and running a speed test and each deco works fine and has internet. Also each deco is broadcasting the 2.4ghz and 5ghz network just fine and it works for those bands.

My IoT network is configured to broadcast only 2.4ghz and use WPA2 so it shouldn't be that as the issue.

What gives?  How come the IoT network feature is not working? I've restarted my network several times. It just doesn't seem to work.