this looks to be a major fault.
My wired connection has failed, the xBox is getting an IP address so the router is seeing it without a problem. But there's no network connection and so no xbox live.
It looks like the xbox is only findind an IPv4 connection whereas it would prefer an IPv6
I've been having this problem for about a month now, I temporarily fixed the issue by switching from 5G to 2G, however I'm back to square one! For the price I'm paying it's not acceptable!
Thanks for getting in touch, I am sorry to see you have been caught up in the issue between the Superhub 2 AC and Xbox live.
We are currently investigating this issue from our side and I will let you know as soon as we know more.
Apologies that I do not yet have more to advise at this time.
Speak to you soon.
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