Netgear: Does my router have IPv6 capability

Contact your net provider to verify if your connection can handle IPV6

IPV6 has to be supported by your router and your ISP. IPV6 is already built into Xbox and when it detects it you're set.

Comcast is my ISP and their network supports IPV6.

I have a netgear router that supports IPV6 and it's just a matter of logging in to the router and enabling the IPV6 feature.

Frontier does not currently provide IPv6, even though the eero router is capable of and has a setting to turn it on. As a result, you will not have IPv6 on your Xbox until Frontier gets with the times

You'll have to check if your Router/Gateway modem supports IPv6. If it does, you need to also check with your Internet Provider if they support IPv6 natively. If they don't you might have to sign up for a Tunnel Broker Service to be able to use IPv6, if
your home network is IPv6 capable and your router can use the service of such a Tunnel Broker.

https://beta.support.xbox.com/help/Hardware-Network/connect-network/ipv6-on-xbox-one

For Xbox One to connect to the internet using IPv6, your home router needs to have IPv6 enabled, and your internet service provider (ISP) must support IPv6.

Is your router a Netgear as well or is it from your ISP? If it is a Netgear here is a link to the steps to enable IPv6.

https://kb.netgear.com/24006/How-do-I-set-up-an-IPv6-Internet-connection-on-my-Nighthawk-router

If the router is from your ISP then you should contact them to get assistance in changing it if you can't do it form the Admin on your network.