Can't find 'Cast' button in Netflix app
If the "Cast" icon is missing when you try to watch Netflix on your Chromecast, it's usually because it isn't on the same network as your mobile device. If you can see and tap the Cast icon, but your Chromecast or TV doesn't appear, follow these steps instead.
Using a mobile device to watch Netflix on a TV isn't available with an ad-supported experience. To use your mobile device to watch Netflix on your TV, you'll need to change to an ad-free plan.
If your account isn't on an ad-supported Netflix plan, follow the steps below to fix the problem.