Comcast ipv6 on MyNet N900

Has anyone been able to get Comcast ipv6 to work on the MyNet N900?  Or ipv6 to work at all?  Works as it should with a different router but not with the N900.

The link below might help, but is better for you to contact Comcast tech support directly.

Doesn’t answer the question, has anybody got  IPv6 to work with the N900?  I can get it to work and have tested it with other routers but it doesn’t work on the My Net N900.