react-native-youtube no video sound when phone is in silent mode

I know there are similar questions, but every solution I've tried has failed, unfortunately. I'm using react-native-youtube and the sound of the videos is not playing on iOS when the phone is in silent mode.

I tried importing <AVFoundation/AVFoundation.h> in the beginning of AppDelegate.m and added this line

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error: nil];

at the bottom of didFinishLaunchingWithOptions as described in their README.

I also tried enabling Audio on the Background Modes in Xcode and added audio in the Background modes in the Info.plist file.

React Native 0.44.3react-native-youtube 1.1.0iOS 11.2.2