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When the screen is unlocked the AVSpeechSynthesizer.speak is working fine and in locked not working do { try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, mode: .default, options: .defaultToSpeaker) try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation) } catch { print("audioSession properties weren't set because of an error.") } let utterance = AVSpeechUtterance(string: voiceOutdata) utterance.voice = AVSpeechSynthesisVoice(language: "en-US") let synth = AVSpeechSynthesizer() synth.speak(utterance) defer { disableAVSession() } Error Log in the locked state [AXTTSCommon] Failure starting audio queue alp![AXTTSCommon] _BeginSpeaking: couldn't begin playback