Audio recorder cannot prepare when background music is playing (ios)

On iOS SDK41 Managed.

In my Expo app and built app, if I have background music playing (like Spotify), the audio will fail to prepare (prepareToRecordAsync) with an error like “Prepare encountered an error: recorder not prepared.”

If I turn off the background Spotify playing, it works, turn Spotify back on, the recording starts failing again. I turn Spotify off. The audio recording starts working again.

I’ve tried various setAudioModeAsync calls including

       playsInSilentModeIOS: true, // they can mute the videos manually
            allowsRecordingIOS: true,
            staysActiveInBackground: false,
            interruptionModeIOS: Audio.INTERRUPTION_MODE_IOS_MIX_WITH_OTHERS, // we want other apps to lower so they can here the media
            shouldDuckAndroid: true,
            interruptionModeAndroid: Audio.INTERRUPTION_MODE_ANDROID_DUCK_OTHERS,
            playThroughEarpieceAndroid: false,

Doesn’t matter what I put error continues to happen, but only if background music is playing.

What am I missing here?