Where Am I Going Wrong? Single NIC Troubles

EChumBucket

Hey guys. I am so unbelievably frustrated and am in need of some guidance.

I’m attempting to run pfSense on a system with only 1 NIC (HP EliteDesk 800 G3) and route my WAN and LAN traffic through VLANs 10 and 1 (respectively), but still be able to use the other 6 ports on the switch as normal. I’m using a Cisco SG250-8P switch set up as follows:

Port 1 - pfSense Router: Trunked
VLAN 1 - Untagged
VLAN 10 - Tagged

Port 2 - Modem/WAN: Access
VLAN 1 - Excluded
VLAN 10 - Untagged

Ports 3-8 - Other Devices Eventually: Access
VLAN 1 - Untagged
VLAN 10 - Excluded

It's not working. My WAN interface isn't getting an IP and I am getting no internet.

What I'm seeing:

After plugging the WAN cable in from my modem to port 2, I see my traffic increase substantially on the Traffic Graphs
I’m not getting an IP on the WAN interface when I connect the WAN cable, which is what’s supposed to happen according to YouTube and I’m not getting access to the internet on an pay ports
In my firewall logs, every 2 minutes I seem to be blocking a private network from WAN. It’s an IGMP request, source: 172.22.81.209, destination: 224.0.0.1

What I've tried:

Releasing and Renewing DHCP Lease on the WAN's interface
Disabled STP on my switch
Hitting it with a hammer

What am I doing wrong? Also, I'm still new to networking so bear with me if I don't understand your technical vocabulary at first. Thanks!

stephenw10

Cross-posted. Continues here: https://forum.netgate.com/topic/172245/single-nic-setup-not-working-as-it-should