Is there a limit to how many NICs you can assign a VM?

[UNRAID5]

I am using pfSense as the DHCP/DNS/NTP server for all of my VLANs. I don't see any way to tag/untag in UNRAID so I am creating an interface for each of my VLANs in Network Settings. I then add an interface per br that I created to my pfSense VM. I can't seem to get beyond 4 interfaces, however. The VM simply won't post with the 5th NIC. Is there a hard limitation that I am running into? Is there anything I can do to add more NICs? Thanks!