Continuity Camera doesn't offer access to iPhone microphone
I'm pleased with the way Continuity Camera allows me to use my iPhone 14 Pro as a webcam, but puzzled that it doesn't give me the option of using the phone's microphone. The iPhone isn't listed among the input options under "Settings / Sound", and it's not on the list of microphone options for either FaceTime or Zoom. The phone's camera appears as an option in both apps, and works fine.
I've studied the instructions here: Continuity Camera: Use iPhone as a webcam for Mac - Apple Support
... and I've tried connecting the phone both wirelessly and with a lightning cable.
Thanks in advance for any suggestions!
M1 MacBook Pro, MacOS 13.1 (Ventura)
iPhone 14 Pro, iOS 16.2
MacBook Pro 14″