Moved to AT&T Fiber, tunnel broken

[BiloxiGeek]

Recently moved from a cable modem with a tunnel setup that was working to AT&T fiber and now I can't get the tunnel working.  I've put the fiber modem (BGW320) into passthrough mode, disabled the IPv6 and it's firewall.

I got this set this up on a Netgate pfSense appliance (SG2100) and it was working just fine on the cable modem.  I've poked around in the pfSense and I don't see anything that seems to be set differently now or needs to be set differently. Is there something about this fiber modem that will block a tunnel from working?