Rax48 router-xbox cant connect ipv6

[Trippopolis]

I selected auto detect because cox doesn't know ipv6 settings. It has dhcp selected with ipv6 addresses showing wan/lan yet xbox is still ipv4. Please help!!

[FURRYe38]

What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

Do other devices get IPv6 from the router when connected? PC or laptop? 

Does changing the IPv6 LAN Setup to Use DHCP Server make any changes? 

Ask MS about xbox networking configurations as well for IPv6.