I want to Airplay a YouTube video to an Apple TV. According to this official support document from Google/YouTube:

As a reminder, if you’re casting from a mobile device, make sure to download the YouTube app. Casting from youtube.com in a mobile web browser is not currently supported.

https://support.google.com/youtube/answer/7640706?hl=en

So, downloaded the YouTube app, can’t find an Airplay icon anywhere. Some users claim its now subsumed under the Cast icon – no luck there for me either.

Turns out, playing the YouTube video directly from Safari shows up the Airplay icon.

*Sigh.