I can't get Netflix to cast from Mac to TV. Chromecast on TV screen says it's ready to cast.

While I don't have a Chromecast device to test the issue (or an Apple PC) Check out this support page and see if it helps any.

https://support.google.com/chromecast/answer/3046480?hl=en&ref_topic=2995192

Finally got it to work. Spent more than hour on the phone with Support. I thought we tried everything and it still wouldn't "cast." (Couldn't get the icon to show up on Netflix screen.)

Here's what finally worked (I did this on my own.)

 I needed to add the Google Cast extension to get Netflix to cast to the TV. I don't know why they didn't name it Chromecast Cast extension.