After downloading iOS 16.1 Hey Siri stopped working. I spent hours on the phone with Apple Support to no avail.

Try these steps

1. Go to Settings.
2. Tap Siri & Search.
3. From here, make sure the following settings are turned on:

• • Listen for "Hey Siri"
  • Allow Siri When Locked

Set up Siri to recognize your voice

1. Go to Settings.
2. Tap Siri & Search.
3. Turn off Listen for "Hey Siri," then turn it back on.
4. When the Set Up "Hey Siri" screen appears, tap Continue.
5. Say each command that you see on your screen.
6. Tap Done.

If Siri stops responding

1. Go to Settings.
2. Tap Siri & Search.
3. Tap Siri Responses. 
4. Tap Prefer Spoken Responses to hear Siri speak responses, even when Silent mode is turned on.

16.1.1 broke it! Worked fine previously. I want the side button to invoke Siri with no audible response. Just on screen answer if an answer is needed. Can you put this back in? It was a great feature! I don’t need audio responses when I am in public, like at the movies, etc! :)

I have the same problem and I followed all your steps but the problem persists.

Looks like a bug.

Environment is IPhone 13 with IOS 16.1.1

Waiting for a fixup