Vlan for lot

[Serius]

I'm in the process of replacing the network devices in my home lab. In my setup I have some servers, a big nas and a domotics system. I'm trying to setup a vlan for this system but I can't make it work. Perhaps someone can give me some advice on how to do it on opnsense.
This is my network structure:
Wan
ISP router (bridge) => opnsense box => dgs-1510 switch -> unifi AP / servers / workstations.
The network is 192.168.0.0/16 and I currently have the devices distributed in "sub networks" as 192.168.50.x for all the iot or ...1.x for the workstations.
I first created the vlan in the managed switch with tag 50 and then changed the WiFi ap so all the devices registered in the iot SSID would get tagged.
Then I came to the opnsense GUI and added the 50 vlan and created an interface linked to it derived from lan. I then went to DHCP and implemented another range for the vlan.

The problem I have is that all the iot WiFi devices don't get an ip. Does anyone knows if I'm forgetting a step? What can I do to diagnose the problem?
Thanks.

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