The app’s Info.plist must contain an NSMicrophoneUsageDescription key with a string value explaining to the user how the app uses this data

For the lazy:

if you want to quickly add usageDescriptions for most media access (on-device photos, camera, video recording, location):

right click your info.plist file and -> open as -> Source Code

then paste the following between the current values:

<key>NSMicrophoneUsageDescription</key>
<string>Need microphone access for uploading audio</string>
<key>NSCameraUsageDescription</key>
<string>Need camera access for uploading images</string>
<key>NSLocationUsageDescription</key>
<string>Need location access for updating nearby friends</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>This app will use your location to show features near you.</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Need photo library access for saving and uploading images</string>

These descriptions, of course, are up to you. I tried to make them as generic as possible.

Hope this saves someone’s time!