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So unless I have a static ipv6 address I cannot use PD?

I have a cable connection through Spectrum. I can request a /56 and use that. It uses DHCPv6 for the wan interface IPv6 address. I do not see anywhere what the /56 being assigned is. On a cisco router I use this:

ipv6 dhcp client pd hint ::/56
ipv6 dhcp client pd TWC-Prefix

so on my other interfaces I can assign like this:

ipv6 address TWC-Prefix 0:0:0:7::/64

I can do the same assignment with the DHCP server and it uses the prefix that is assigned.

I have gotten the ip assignment now using the "Configure IPv6 for generic DSL dialup" but I cannot figure out where my pd assignment is or how to use it. This configuration should be easy and straight forward.

I have been searching everywhere and can find nothing that shows how to configure ipv6. I am connected to spectrum and I should be getting an /56 pd. I have configured everything that i can see that needs to be configured and I cannot even get an IPv6 address on the wan interface. I did once but then it was gone never to return again. Is there anywhere a step by step guide to configure IPv6 on the wan interface with a /56 delegation that can actually be used on your internal network?