In this episode, Tyler demonstrates how to enable audio descriptions for the TV app, as well as for videos on supported websites in Safari on iOS, iPadOS, and macOS. Note that not all apps and websites that offer audio described content detect this setting, meaning you'll have to manually enable audio descriptions through the playback interfaces of such services.
To enable automatic playing of audio descriptions for the TV app and Safari on iOS and iPadOS, go to settings > Accessibility > Audio descriptions, and enable the "Audio descriptions" toggle. To do the same on macOS, go to System Settings > Accessibility > Descriptions, and enable the "Play audio descriptions when available" toggle.
Could do with a transcription of these podcasts for those of us who wish to get the information more rapidly. In this case I was already aware of the setting in accessibility and was hoping for a way of toggling AD on and off more consistantly than the rather diverse ways of doing it in other apps. I'd have recognised that this wasn't the tip for me if it had been written rather than the requirement to listen to the full audio.
Thanks for the tip though, I'm certain it wil make all the difference to those who are not already aware of it.