Microphone stopped working with indoor camera

We use an indoor camera as a baby monitor in our twins room. The microphone worked for several months, but now has stopped. We can still hear the kids through the app, but when we try to speak to them the sound doesn’t come through the camera. We’ve tried disconnecting and reconnecting, as well as checking our settings to ensure the mic is allowed. I’ve uninstalled and reinstalled the app too. We just got this camera less than 6 months ago.