MediaSessionCompat:Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent

If you are NOT USING PendingIntent anywhere. The issue might be resolved by adding or updating this dependency

    // required to avoid crash on Android 12 API 31
    implementation 'androidx.work:work-runtime-ktx:2.7.0'

This fixed my problem.