Xbox Series X is using IPv4 and not IPv6

You could try setting a manual IPv6 address as shown in the forum post here.

https://answers.microsoft.com/en-us...series-x/cc47da81-9a90-442d-90d7-1cdb66802a45

The IPv6 is enabled on my router thru my isp. But it still doesn't come up on my series x. I also cannot disable the IPv4 for others in the house is using it.

It might be that your ISP is using IPv6 and tunneling IPv4 via CG-NAT and DS-Lite.

While IPv6 is generally a Good Thing to have (as the Xbox One primarily uses IPv6, and even if you only have IPv4, it will use IPv6 tunneled through IPv4), you might want to check with your ISP if they offer you a "Dual Stack" connection with IPv6 and a
real public IPv4 in parallel.

There really isn't much you can do on the console itself, as it does check automatically what IP protocol your ISP provides, and if it's IPv6, then the console will use IPv6. If it's a Dual Stack, where you have IPv4 natively (not tunneled through IPv6)
and IPv6, then the console will use both, and if it's an IPv4 connection, it'll tunnel IPv6 through IPv4 through Teredo.

Hey there!

Nice to meet you! I'm Darhyl, a fellow gamer. I'm sorry you are experiencing this. I am here to help.

If I may ask, may I know which platform device are we referring to here, is it on Windows PC or Xbox console?

If it's on console, to switch from IPv4 to IPv6 on Xbox Series X, you can follow these steps:

On your Xbox Series X, go to Settings.

Select Network.

Select Advanced Settings.

Select IP settings.

Change the "IPv6" setting from "Automatic" to "Manual."

Enter your IPv6 address, subnet prefix length, and default gateway information provided by your Internet Service Provider (ISP).

Save your changes.

Note that not all ISPs support IPv6, so you may need to contact your ISP to confirm if they do and obtain the necessary information to set it up on your Xbox Series X.

Thank you for your time. I hope you have a great day!

Reference link: https://answers.microsoft.com/en-us/xbox/forum/...

IPv6 depends on your Internet Provider and your router being able to provide IPv6 in your network.

Your PC can be set up to use tunneling techniques to use IPv6 through IPv4 tunneling, and the Xbox does this as well.

Most networking stuff in regards to multiplayer and party chat supposedly run via IPv6, and if IPv6 isn't natively available, Teredo is used to tunnel IPv6 through IPv4.

So please ask your ISP if they natively provide IPv6 (ideally in a dual stack configuration with IPv4 in parallel), and check the documentation of your router if it supports IPv6 as well.