Unknown intent HassMediaPlayerMute

When asking Assist to mute a media_player, I get the response “Unknown intent HassMediaPlayerMute”

I checked the built-in intents list but I don’t see that intent. I do have some existing configuration related to intents:

intent:
intent_script: !include intent_scripts.yaml

The latter of which points to intents that I’m using for my Alex skill. Did I miss an update where I needed to adjust my config?

Wait until November. This intent was added just two weeks ago and should be included in the next release.