I'm surprised no one else replied to this. But it took me 10 days too. It seems to be an issue with build .218 and .318 in combination with the app. The Netflix app works just fine on build .164...
I'm in contact with Netflix about this, it turned out they haven't heard about it yet, although quite some reviewers in the store have pointed this out.
Let's hope they will get on this, I didn't use Netflix much on my Lumia 950, but would like it to work again!
PS: this happens on Windows 10 Mobile only.