Apple Watch Series 7, watchOS 11.0.1, no more sound

I have an Apple Watch Series 7. The watch produced audio up to and including watchOS 10. Once I updated to watchOS 11.0 and then to 11.0.1, the watch no longer produces audio output. Siri voice doesn't respond to my prompts; my notifications are via haptics only; all audio is no more.

I have reviewed the following support documents:

• Adjust the volume, sounds, and haptics on Apple Watch - Apple Support
• Choose an audio destination on Apple Watch - Apple Support
• Change the audio and notification settings on your Apple Watch - Apple Support

I have checked the following on the watch:

• Press side button -> (speaker icon) -> volume max
• Press side button -> (bullseye and triangle icon) -> Apple Watch
• Press side button -> (bell icon) -> silent mode off
• Press side button -> (moon icon) -> Do Not Disturb -> off
• Press dial -> Settings -> Notifications -> Siri Announce Notifications -> on
• Press dial -> Settings -> Focus -> Mirror my iPhone -> on
• Press dial -> Settings -> Siri -> Siri Responses -> Spoken Responses -> always on
• Press dial -> Settings -> Siri -> Siri Responses -> Voice Volume - Speaker -> volume max
• Press dial -> Settings -> Sound & Haptics -> Ringtone and Alerts -> volume max
• Press dial -> Settings -> Sound & Haptics -> Silent Mode -> off
• Press dial -> Settings -> Sound & Haptics -> Workout -> Voice Feedback -> on
• Press dial -> Settings -> Gestures -> Cover to Mute -> off

Nothing seems to fix the audio issue. I can't find information on how to roll back to watchOS 10.

Any ideas? Thanks!