How to get Siri to listen to audio input on MacOS

Sequoia 15.1, 2023 M2 mini I would like Siri to respond to my spoken voice (not typing). When I have voice control activated, I can say "open siri" and Siri opens for typing input. The words I speak show up and Siri responds to my request when I press enter. If I click on the microphone icon to Talk to Siri, Siri does not respond to the words I speak. When I do not have voice control activated, I manually click on the Siri taskbar icon and it comes up in Talk to Siri mode. Siri does not respond to the words I speak. Sound input is set to this external microphone (below), which works great for voice control. It does not work for Talk to Siri. Is there a specific device setting for audio input for Talk to Siri? What configuration am I missing to make this work?