i don't have Teredo card

I don't know anything about Cisco routers but is there an option in there somewhere about turning on ipv6 teredo tunnels. I know some routers have this option and if it's switched off you get teredo errors.

maybe because I don't have teredo tunneling adapter and I can't find it in legacy hardware.

https://prntscr.com/k9htnf i Don't have Teredo i watch very video but none work

Thanks for the keeping us updated. Let us further isolate the issue by trying to access the game using your account on a different Windows 10 device and check if the issue persists.

Forza Forums are created to help player who's having complicated issues like this. The suggestion above to post this on Forza Forums is to check that all supports are looking at this matter.

Kindly update us if the same issue will occur using a different device.

knowing that I have 2 network card and 1 pc laptop and that on 2nd computer I used another tale for me connect with teredo and that it still does not work I would like to know if you would have a script or a file an update teredo or an update of teredo itself
that I want to download to completely reset teredo

I don't know if you also checked this, but there are some router models that filter Teredo packets and thus block you from using Teredo.

I can only speak of a AVM Fritz Box router, since I have that kind of router. There for example you'll have to enable the expert view of the settings menus, and then disable the Teredo filter of the router.

It might help, if you tell us the make and model of your router and modem or gateway hardware. Maybe the solution can be found there.