I was a Spectrum customer for 2 years and play Mario Party online with my friends, one of whom is a T-Mobile subscriber. I switched to T-Mobile internet on 12/29/23 and now we cannot play any Nintendo online games together. I can still play online with my friends who use Verizon and Spectrum Internet.
My friend and I both have a Sagemcom Fast 5688W Gateway. NAT type B. I also tried the wired connection. We have even tried playing on another friend’s T-Mobile gateway and it seems T-Mobile will not connect with T-Mobile. I am now trying a Verizon gateway and my T-Mobile friend and I are able to play online together again.
It would be great if T-Mobile would fix this issue. I do not want to subscribe to Verizon, but I may go back to Spectrum after 90 days if the T-Mobile issue persists
