We were having the SAME issues and couldn’t figure anything out. We are finally gaming on our T-Mobile internet after turning on the DSCP and WMM tagging. It is under internet settings, advanced settings, QOS tagging settings. I hope this helps you too! Thank you for solving my problem!
Hey yall I just recently got the 5g gateway and immediately noticed the Upnp setting was not successful meaning were going to have party chat issues if you play or talk with your friends online. The only solution I'm being able to find is using discord party chat that you can now use on Xbox. Tried multiple things to fix Xbox party chat with no luck. But using the discord chat I had no issues. Hope this helps We are having same issue of not being able to do online gaming. It worked yesterday but not today:( Look at what Chey_Z02 said. You change your Xbox settings and it should work.
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