From IPv4 To IPv6

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.

Teredo isnt actually a program or file. It has to do with tunneling an IPv6 connection on a IPv4 internet connection. You might check with your ISP and see if they offer IPv6 in your area. If they dont xbox live seems to have an issue with tunneling. I
would recommend going into your router and see if your router is tunneling IPv6 to IPv4 and just disable the IPv6 and just use IPv4. Xbox seems to run great off a true IPv6 connection but doesnt do well if you are tunneling it from the older IPv4.

I opened a port forward for my console and assigned it a static IP

Hi BlkstIvory76, I hope you're doing great out there despite the issue that you're experiencing. I am an Independent advisor and I am here to help you in regards to your concern.

Several home routers support IPv6 but disable it by default. Check the manual for your router, or reach out to your Internet Service provider to help and guide you in enabling it.

For your reference, you can check this link: https://support.xbox.com/en-US/help/hardware-ne...

Thank you for letting me know, BlkstIvory76. Try contacting your ISP to see if IPv6 is available in your area.