I am in the process of slowly optimizing my home LAN/WAN. Most recently, I traded pfSense+ running on a Netgate 1100 appliance for a UCG Ultra. It was the last non-Unifi piece in my networking stack.
As is often recommended, I have everything working with essentially default configurations before trying to assert some firewall rules to restrict intraVLAN traffic and I hit a bump in the road with my cameras. I have a mix of WiFi and hardwire Amcrest cameras. I am having difficulty getting the hardwire cameras to pick up a IP in the Camera VLAN.
The cameras themselves do not have any VLAN settings in their configuration. In my previous experience, I would need to set the switchport to be untagged VLAN 3.
However, once I do that, the camera never picks up an IP from DHCP for that network. It just shows the VLAN ID and a new field “Virtual Network Trigger”, a term I have not found anywhere except in Reddit posts where people also don’t know what it is 
So long as I leave the switchport in the Default VLAN, the camera picks up a Default network IP and works fine, other than I want it on a different VLAN so I can properly limit VLAN hopping.
I hope it is something that is behind a checkbox that I have missed or maybe something that is just Unifi weirdness that I don’t know about yet
Robert