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Comcast business users can get a /56 by requesting it in their dhcpv6 settings.

I have Business. I request a /56. It gives me a /60. I try to partition that out into subnets, but prefix-delegation (PD) fails at that point.

Sounds like a router configuration issue. I have no issue getting a /56 and handing out /64's on a Comcast Business line.

Do you have a static v4 block as well?