NAT type on Windows displays "Teredo is unable to qualify"
Failure to obtain a Teredo IP address can occur when there’s an issue with your Teredo adaptor, when a device on your network is blocking the Teredo protocol or if there’s software installed on your PC that’s disabling Teredo functionality.
National Public Data breach: What you need to know
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“NAT Type: Unavailable appears in your network settings
Make sure your router has Teredo connectivity enabled. You can find out how to check Teredo connectivity for your router in its manual or on the manufacturer’s online support site. For Apple AirPort and AVM FRITZ!box routers, see: Restart your router and your Xbox console.
Xbox network server connectivity on Windows is blocked
Find out how to fix network connectivity problems when using Xbox multiplayer and chat features on Windows 10/11.
Network settings on the Xbox console
Learn about the network settings on your Xbox console and common network troubleshooting tests.
Xbox Status | Xbox Support
Accessible help and resources to get your Xbox questions answered. Check the Xbox services, games, and apps for any service outages.
Network ports used by the Xbox network on the Xbox console
Learn which network ports are used when configuring a firewall or router to use with an Xbox console and Xbox Live.
Troubleshoot NAT errors and multiplayer game issues
Under Current Network Status, the NAT Type field displays your current NAT type. You need your NAT type to be Open to resolve this issue. You also want to make sure there are no errors such as Double NAT detected or UPnP not successful displayed.
Double NAT detected in your network settings | Xbox Support
Accessible help and resources to get your Xbox questions answered. If you see “Double NAT detected” in your Xbox network settings, try these steps to change or remove it.
Troubleshoot multiplayer connection errors | Xbox Support
Find solutions for errors when you run the Xbox multiplayer connection test.