@craigmod what happens if you try to plug a computer into the IPoE Ethernet port? Are you able to get an IPv6 address and get whatismyip.com to detect your ipv6 connection?

When I was on NTT+OCN a few months ago, I had two devices from them, on was a small IPoE device (no wireless) that I had to stick between the ONU/Router and my LAN to get IPv6:

https://www.aterm.jp/product/atermstation/topics/warpstar/ipv6.html