Netflix no longer streaming

Does the laptop connect through the gateway and which gateway do you have? You state from Safari on your laptop works. What is your laptop and can you see a difference in the IP addressing of the laptop that works and the other devices? So, also you state you tried updating the DNS server settings to google on your router. Do you have a router connected to the T-Mobile gateway? 

What network does the laptop connect to? Is it also connecting via wireless or with an Ethernet cable and is that to wireless via the T-Mobile gateway direct on its wireless or via a connected router? 

The suggestion to change the DNS on a client was to see if it would help but was only based upon the possibility that it might if the DNS from the 192.168.12.1 gateway address was not working. I have seen a recent period when DNS here was failing and I changed my MacBook DNS to quad9s and it resolved the issue for me. I still have my MacBook Pro with 9.9.9.9 for DNS and Netflix and Amazon Prime both work for me. I have the Nokia gateway so I also have not seen any postings to know if the issue has some bearing on any specific gateway. From the Reddit conversation is sounded more like the engineers were working on some solution but it was not clear what. I wish T-Mobile would actually post some reference to issues like this which impacted many users. If I see more on this I will let you know.