I’ve used ipv6 on xfinity for years, but I do use my own equipment. Unless there are regional differences it’s important to make sure it is set up right in your router.
You're absolutely right. I'm in the same situation. 10/10 ipv6, but it took a lot of configuration. I'm sure if the parent commenter connected their device directly to their modem via ethernet they'd find they had a functioning ipv6 address. Comcast is terrible for lots of reasons, ipv6 isn't one of them.
exactly what happened. I had ipv6 disabled on my amplifi router, quick switch and its all systems go