I just recently purchased an ER707-M2 gateway and a SG3428X-M2 v1.20 switch (running 1.20.15).  I have a software-based Omada controller (v6).  I have been struggling to get DHCP to actually work.  Network connectivity works fine as I can ping IP addresses and access the internet.  I also have an EAP720 that I am trying to get working on the camera VLAN (40).  The controller cannot see the EAP720 when on the camera VLAN.  However, if I move the EAP720 over to the default network, it can be configured.  Only two ports are set up in the Camera VLAN (ports 3&4 on the switch).  I'm not sure where to start troubleshooting as I have recreated the camera and reconfigured the network settings with no luck.  Here is the configuration and topology for the default and Camera networks: