I have a similar setup only with unifi switch and not edge switch and unifi APs
I have a VLAN 20 on my setup which is up and running which I configured last night.
Your Network configuration however is different. I selected VLAN only since pfsense was handling all my DHCP functionality. I see in your Network setup VLAN only is greyed out and says USW required (which I don't know what that means). In terms of DHCP mode, have you tried just setting it to None.
Did you setup a DHCP server on pfsense for the LAN within Pfsense. I terms of your Edge switch, it seems like you've setup your trunk port appropriately (I would guess - I've never used an edge switch).