Michael, Discovered that something in my setup sets my master volume down to 0. This appears to be a separate control than what the knob sets. No idea what is the root cause of that, but if I go in and increase the volume from there I can hear the sounds. So the error was a red herring.

I have added the AVAudioSession.sharedInstance().setCategory(.playback) code. It makes no difference. Is there a current sample app that I could try that should work with iOS 26? I've been blocked on this for weeks.

Unmodified code from here https://developer.apple.com/documentation/visionos/playing-spatial-audio-in-visionos I am not mirroring my screen. No sound connected to Xcode and I get the error in the log. No sound if my VisionPro is not connected to Xcode. I have a Gen 1 Vision Pro and using Xcode 26.4.1