I posted to AT&T forum and an amazing user helped me with a new understanding of IPv6 on AT&T. I only know him as tinslwc. I credit him with teaching me about IPv6.
IPv6 Status Available Global Unicast IPv6 Address 2600:1702:980:25e0::1 Link-local IPv6 Address fe80::eea:c9ff:feb8:84e0 IPv6 Addressing Subnet (including length) 2600:1702:980:25e0::/64 IPv6 Delegated Prefix Subnet (including length) 2600:1702:980:25ef::/64
Global Unicast IPv6 Address 2600:1702:980:25e0::/60
You can create 2600:1702:980:25e8::/64 to 2600:1702:980:25ef::/64
tinslwc did DHCPv6 and can’t get the other 8 /64 subnets to come down.
2600:xxxx:yyyy:25e1::/64 to 2600:xxxx:yyyy:25e7::/64
We are still working on why? So instead of using /67 blocks, I now have /64 blocks on each interface.