AT&T Fiber and IPv6

[KStarRunner]

I followed the guide at https://docs.netgate.com/pfsense/en/latest/recipes/authbridge.html and successfully bypassed my AT&T Arris router. IPv4 works without issue, but I don't get any IPv6 addresses. Nothing gets assigned to the WAN interface nor the LAN interface. I've triple-checked that I did everything in the guide. Any idea where I might go poking around?