Netflix no longer streaming

If the site does not report both the IPv4 and IPv6 addressing it would sugieren there is no IPv6 address but I have seen the site report one or the other or both at times. Usually it does report both IPv4 and IPv6 addressing. Keep in mind the external IPv4 address you see on that site reflects the external address on the other side of the T-Mobile IPv6 network. T-Mobile runs their network on IPv6 and uses what is referred to as carrier grade NAT (CGNAT) or what is also 464XLAT. It is a translation from IPv4 to IPv6 and then IPv6 back to IPv4. The IPv4 addresses can change/rotate. If you use the site and repeat the test for your external address 5-6 times over a minute or two you puede see the IPv4 address changes due to the routing of the traffic and how it is handled. Today my external IPv4 address is not changing is it does when traffic levels are higher. I have seen it change between 5-6 addresses over a period of time.  Previously the traffic was being routed out of Atlanta and now I am seeing the routing seems to be out of Nashville instead. It seems to be the ever evolving T-Mobile internet solution.

You need to look at the configuration of the networking for the client. See if it has both IPv4 and IPv6 and have both set to obtain their addressing automatic via DHCP. It could be IPv6 is not enabled or the client does not support IPv6 but most clients support dual stack these days so it might just be disabled.

If you have not pointed your client to another DNS server like Google or Cloudflare you might try that vs allowing the gateway to delivery the DNS. 

NOTA: The message, "Your private information is exposed!" reflects that you are not using a VPN to hide your actual IP addressing information. Lots of companies would like to have you subscribe to their VPN service. :-) For more sensitive information it is a good practice but gets expensive.