As ActivityKit is not gonna be available on iOS 16 release, you should use Xcode Beta in order to keep working with ActivityKit as its "beta exclusive" for now.

So! In first instance I setup AVAudioSession.sharedInstance().setCategory(.playAndRecord) only for the matcher! But then I forgot that I have it also when setting up the player. So I did the same inside the Player and it's now working good! Thanks a lot!

Unfortunately it still doesn't work... It's really weird that the second in which I start to play the sound the matcher is not working anymore or maybe it's the AVAudioSession... I really don't know... If you have any other idea or suggestions, will be really appreciated. Thanks a lot !

Thanks a lot for the reply. In specific: My app is running the matcher as following (snippet from the code session) if let catalog = try CatalogProvider.catalog(signaturePath: data) {                                                 try matcher.match(catalog: catalog)                                             } At this point the app I'm calling a function called playSounds and I'm passing a URL, that is a remote URL of an .mp3 file hosted on my server. func playSounds(soundUrl: URL, atTime: Double) {         //Remove previous player         self.audioPlayer?.removeObserver(self, forKeyPath: "timeControlStatus")                  //Setup new player         do {             try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)             try AVAudioSession.sharedInstance().setActive(true)             audioPlayer = AVPlayer(url: soundUrl)             audioPlayer?.addObserver(self, forKeyPath: "timeControlStatus", options: [.old,.new], context: &playerContext)             guard let player = audioPlayer             else             {                 return             }             player.playImmediately(atRate: 1.0)             player.seek(to: CMTime(seconds: atTime + 2, preferredTimescale: CMTimeScale(1.0)))         } catch let error {             print("ERROR AUDIO",error.localizedDescription)         }              } After that playSounds function is called, the matcher stop to do any match. It's basically not working and it's returning me the error that I mentioned above. Platform: iOS 15 on iPhone X. The match function is below: func match(catalog: SHCustomCatalog) throws {                  session = SHSession(catalog: catalog)         session?.delegate = self                  let audioFormat = AVAudioFormat(standardFormatWithSampleRate: audioEngine.inputNode.outputFormat(forBus: 0).sampleRate,                                         channels: 1)         audioEngine.inputNode.installTap(onBus: 0, bufferSize: 2048, format: audioFormat) { [weak session] buffer, audioTime in             session?.matchStreamingBuffer(buffer, at: audioTime)         }                  try AVAudioSession.sharedInstance().setCategory(.record)         AVAudioSession.sharedInstance().requestRecordPermission { [weak self] success in             guard success, let self = self else { return }             try? self.audioEngine.start()         }              }