The person I was speaking to on twitter mentioned that everything was working, then he moved house in January, then it stopped working. This was the middle of January. This started happening to me before Xmas. I can't see how this could be the TV or the app if they are both the same.
I have no idea if this is possible on your TV and you may already have tried it if it is possible but are you able to access Netflix via a browser on the TV instead of using the Netflix app?
Every other device seems to work. Except my LG TV, but this is what I use to watch Netflix because it is 4K.
It does have a broswer. I can log into the netflix site. But netflix is does not seem to be supported on this browser.
I just want my LG TV being able to connect and play 4K netflix. Do you work for BT?
Just to recap to save any wasted effort.
Resetting the hub or TV does not help.
All other apps work fine on the affected TVs and Netflix works on all other devices.
The Netflix app works fine on the TV using a smartphone as a hotspot on 3G 4G.
Netflix passes all connection checks on TV.
If you are able to get to a 'sign out' screen in the app you can often sign in and the app will work for that session.
For me both the TV and Netflix app are the latest version.
I have replaced my router for a non-BT one at a cost of £80 to resolve the issue.
I think we just have wait for BT to fix or resolve the situation. Nobody should have to use their own money to buy a new router.
I'm also affected by this. I spent 2 hours on the phone with BT's Indian technical team who were completely incompetent and left this unresolved. I asked if they even knew what a DNS server was and of course, they said they did but then could not tell me. BT - sort this out.
Thanks all for posting. I'm sorry we haven't been back but as per my message on post 30 we're still looking into this and hope to get you all an update soon.