Thanks — I’m sorry you’re seeing that intermittent iOS crash when calling

room.localParticipant.setMicrophoneEnabled(true)

. I’m responding to the crash error

com.apple.coreaudio.avfaudio required condition is false: IsFormatSampleRateAndChannelCountValid(format)

and the fact you have already confirmed microphone permission. A few targeted troubleshooting steps and quick questions to help isolate the cause: Suggested quick checks (try these first) • Add a short delay (100–300 ms) after confirming microphone permission before calling

setMicrophoneEnabled(true)

to avoid a race where AVAudioSession isn’t fully ready. • Reproduce in a minimal app: create a small Expo/React Native project with only LiveKit + react-native-webrtc to rule out conflicts from other audio/background plugins (e.g.,

expo-av

, background audio). • Ensure

livekit-client

and

react-native-webrtc

are up to date — audio format fixes are often released in those deps. • Temporarily disable other audio apps/plugins running in your app to check for interference with AVAudioSession. If you can provide any of the following, it will help me narrow this down: • Expo/React Native versions,

livekit-client

and

react-native-webrtc

versions. • Whether this occurs on device only, simulator, or both, and iOS versions where it reproduces. • A minimal code snippet showing how you request permission and call

setMicrophoneEnabled

. • Any console or device logs around the time of the crash (stack trace or preceding AVAudioSession logs). If you’d like, I can walk through a minimal repro with you or suggest a small native AVAudioSession configuration to try if you can add a tiny native module. Which of the above details can you share? Sources: client-sdk-react-native | livekit/livekit_composite | DeepWiki | client-sdk-flutter | livekit/livekit_composite | DeepWiki | [Flutter iOS] SoundWaveformWidget / AudioVisualizerWidget Not Working (Miss...