In the Port Forwarding configuration I found quite a number of entries which I did not configure. One set of these entries is for a protocol called Teredo. Searching the internet, I find a number of discussions claiming these were configured by Verizon and are part of their scheme for translating IPV4 running on my home network to IPV6 running
Finally fixed my Teredo! Read this in case you have Jun 12, 2012 Fix Teredo Tunneling Pseudo-Interface on Windows 10 Nov 15, 2019
Jun 12, 2012
Oct 29, 2017 router port forwarding entries configured by and required In the Port Forwarding configuration I found quite a number of entries which I did not configure. One set of these entries is for a protocol called Teredo. Searching the internet, I find a number of discussions claiming these were configured by Verizon and are part of their scheme for translating IPV4 running on my home network to IPV6 running Xbox One and Teredo (UDP port 3544) | Netgate Forum
Teredo is used to give IPV6 connectivity on an IPV4 network so allowing IPV6 traffic (under Advanced -> Networking) may be necessary. Teredo requires a static outbound NAT rule (NAT -> Outbound). Specifically on destination port 3544 but you can make the outbound rule to that applies to all ports.
Teredo is the name of the Internet. IPV6 I believe is what the technical term that is called. If you are getting errors with teredo, that means your xbox is attempting to connect through your router, which for some reason is not compatible. this could be fixed with a simple full on power down of the Router How to get Open NAT on Xbox One with port forwarding Jul 31, 2018