Cannot hear sound from camera

2 new cameras. Updated firmware. Verified sound is on in the app and sound recording in advanced settings. Increased sensitivity to Max. Can talk into app on multiple devices and speaker on both cameras operate just fine. Cannot hear ANYTHING but low hum from speakers on both cameras. Restarted cameras in the app with exact same outcome: No Sound from speakers on cameras when I speak into app. No sound on recordings and no sound when I am inches from cameras and yell into them.