Issue - Setup a Transparent Bridge in Hyper-V

Hi,

I'm in the process of setting up an install of UTM 9.4 as a transparent bridge between my Ubiquiti UGS and my ADSL Modem in a Windows 10 Hyper-V install.

I currently have the following network topology:

Modem -- 192.168.2.* -- Ubiquiti USG -- 192.168.1.* -- Network Switch

What I'd like to do is:

Modem -- 192.168.2.* -- UTM Transparent Bridge -- 192.168.2.* --  Ubiquiti USG -- 192.168.1.* -- Network Switch

Or alternatively:

Modem -- 192.168.2.* --  Ubiquiti USG UTM -- 192.168.1.* -- Transparent Bridge  -- 192.168.1.* -- Network Switch

I have 4 network ports on my physical machine and have set up the Hyper-V virtual machine with 3 NIC's (1 * NIC for management on on the 192.168.1.* subnet and 2* NIC for the bridge on the 192.1268.2.* subnet)

I have followed the KB instructions for setting up the bridge, set the firewall rules, the application rules, ensured the default gateway is on the bridge (same as the modem) but nothing.

The firewall livelog shows little activity, a few 224.0.0.1 pings and not much else. I have no communication between the Ubiquiti USG and the modem.

I've read that it is either not possible with Hyper-v, the NIC's need to be in promiscuous mode or that it should be working fine.

Any help or pointers would be greatly appreciated as it's driving me mad.