Two Xbox ones in the same house 2020

In firewall settings in router, turn off SIP ALG

Reading through the replies the problem lies with your intranet (Local LAN) connection as it sounds like through Live is okay (which reflects the NAT Open status).

Here are a few links to walk through. No, you do not need special headsets, additional gear and hopefully, the AT&T router will support. If you give me the make & model number I will look that up.

https://www.windowscentral.com/xbox-one-port-forwarding

https://beta.support.xbox.com/help/hardware-network/display-sound/troubleshoot-xbox-one-party-audio

https://beta.support.xbox.com/help/Hardware-Network/connect-network/multiplayer-cross-network-play

Please keep giving me details. This is definitely solvable. Note the UPnP settings will work great for the Internet but may not for Localnet, so please give me the port settings your router shows.

Have you tried via PCs or smartphone?

Never had any issues in our house (two xbox family) - sorry to hear of your issues.

Other than the open NAT suggested above I have no idea

Make sure under your settings that your NAT is at least medium or open, restart and retry party chat. Like Bokor Zombie, we also have six active Xbox's and chat in our house. No issues talking with one another.

Hi
Ant'sLand216,

Thank you for coming to the Xbox forum for help with your issue. We have 6 Xbox's in the on house and we can all chat - so having 2 you can definitely do. Set up both consoles as you would if you only owned one, connecting via Ethernet or WiFi. You can even
set it up to have it with one xbox as the home Xbox which means you can share games -

https://beta.support.xbox.com/help/hardware-network/console/my-home-xbox

As for being able to chat to each other it is no different to chatting to a mate. They send an invite to the other and go from there.

Now, obviously if you are following these thing and it is still happening are you getting anything on the screen to say there is an issue etc.

Do both headsets work when they are playing alone on a game or in a party with someone else please?

Thank you