xbox one cant get Teredo ip address to play backwards compatible games online

[ps4onex10]

My friend and I are trying to play black ops 2 online. When he starts up his game, his xbox says "cant get Teredo IP address. I know Teredo is a tunneling protocol to allow IPv4 but how do we fix this for his xbox?

 

[lpj_5]

changing the NAT settings fixed this for me, but when the Xbox was connected to a WiFi extender, it had this problem everytime I turned the console on, connecting directly to the router stopped this.