UPnP not successful on Xbox Series S

Hadesisfedup wrote:

After four and a half hours and calling T-Mobile customer service and the lady not having a clue how to help. We finally got a solution and tested it on Xbox series x console and it worked. What we did is went into the T-Mobile internet app (make sure it's connected to WiFi on your phone) and go to the "my WiFi " tab and go down to where it says "my networks" and then click on the network name you have and open "network details" then go down to advanced settings and change the following recommendations to these: 

frequency band: 5GHz 

WPA version: WPA/WPA2 

WPA encryption mode: TKIP+AES 

 

then click save changes and the modem will restart with the new settings approx 5 minutes. And then restart your console and connect to the internet name you have.

on your console (ours was Xbox ) go to network and then advanced settings and open "QoS tagging settings" make sure the DSCP tagging and WMM Tagging are enabled. And tab over to restart now and restart the console again. 
all of this made me and the pregnant wife so mad. So we are paying it forward to the next person who needs help and hopefully it will work for you cause this worked for us and we were able to play MW3 with ease finally. Edit: changing the port setting helps the nat type changing to "open" for multiplayer game play and getting into a lobby.