Voice memos record fine. Phone calls sound clear. But one app hears nothing at all. The fact that the hardware works elsewhere is the most useful piece of information available, because it rajaong eliminates the expensive explanation immediately and points the investigation squarely at permissions and app state.

What Is Likely Causing It

• Microphone permission was declined for that app, or was granted once and has since been revoked.
• Screen Time privacy restrictions can block the permission from being changed.
• A Bluetooth device is holding the audio input route, so the app records from a headset in another room.
• The app has a bug in its own audio handling that a restart or update clears.
• An app updated recently may need to request permission again and the prompt was dismissed.

First Steps to Try

1. Open Settings, Privacy and Security, Microphone, and confirm the app’s switch is on.
2. If the app is not listed at all, it has never requested access, so use the feature in the app to trigger the prompt.
3. Force close the app and reopen it.
4. Disconnect any Bluetooth headset or speaker and test again.
5. Test the app on a Wi-Fi call or a video call rather than a recording feature, because the two use different audio sessions and the result narrows the fault quickly.

If the Problem Persists

1. Check Settings, Screen Time, Content and Privacy Restrictions, and set Microphone to Allow Changes.
2. Toggle the permission off and on from the privacy screen to reset a stuck grant.
3. Offload the app from iPhone Storage and reinstall it, which rebuilds a damaged container without losing data.
4. Delete and reinstall the app as a final step, after confirming its data lives in an account rather than on the device.
5. Check Settings, Sounds and Haptics, and any hearing accessibility feature, since audio routing options can send input somewhere unexpected.

Safety and Data Warnings

The orange dot at the top of the screen indicates the microphone is active, and it is worth learning to notice it. If it appears when no app should be listening, investigate rather than dismissing it. Never install a configuration profile offered as a fix for audio permissions, as a profile can grant far more than a microphone.

Conclusion

One app failing while everything else works is a permission problem, not a hardware one. Check the privacy list, look at Screen Time, and disconnect Bluetooth before assuming anything else. Offloading and reinstalling clears the remainder, and if the app never appears in the microphone list at all, it simply has not asked yet.