

Did you change the native VLAN to IoT or just added the tag and left the native VLAN on the switch port set to default? You should be able to change the native VLAN and leave tagged VLANs as “allow all”.
My only other thought is how did you isolate the IoT network and are you able to access other devices from default to IoT?
DCM looks somewhat interesting, I’m not sure I have a use case for it between proxmox helper scripts and the “Docker run to Docker compose converter” in it-tools, but I always like messing with new containers so I might spin up DCM just to see if there’s a use for me.
I also find it a little funny that DCM is a docker container that you have to copy a compose file from the documentation to launch when that is the exact use case they are saying you can avoid by using it.