Video of fallowing steps :
So I have repeated exactly what you described and this is it :
I think you need a bit more for access to microphone and screen under privacy on Mac , in Xcode it in Sandbox .
What do you try to achieve with this ?
E 0:00:00:280 init_input_device: Condition "result != noErr" is true. Returning: FAILED
<C++ Source> drivers/coreaudio/audio_driver_coreaudio.mm:438 @ init_input_device()
W 0:00:00:280 initialize: All audio drivers failed, falling back to the dummy driver.
<C++ Source> servers/audio_server.cpp:244 @ initialize()
There is open bug for this →
Also I have tried myself to recreate it
extends Node
@onready var mic_player: AudioStreamPlayer = AudioStreamPlayer.new()
func _ready():
mic_player.stream = AudioStreamMicrophone.new()
add_child(mic_player)
mic_player.play()
compile add it into Applications, no difference it won’t ask Mac OS for privacy adjustments on Microphone so it will fail without even trying 
