No detection of Bluetooth audio device's use (input & output)

[T-Bendrath]

Device model, version and app version
Model Name: MacBook Pro (14-inch, 2021)
macOS Version: 12.0.1
App Version: 2021.12 (2021.312)
Safari Version: 15.1

Home Assistant Core Version
2021.11.5

Describe the bug
The sensors of the MacOS companion app indicating the Active Audio Input & Output devices seem to not work for Bluetooth devices. When the Audio Input device (microphone) is currently in use, e.g. in a call, the sensors binary_sensor.audio_input_in_use and sensor.active_audio_input do not change and remain true and Inactive respectively. I tested this behavior with Apple AirPods Pro and Jabra Evolve 75 in MS Teams calls. I identified this behavior a few days ago already with App version 2021.12 (306) and thus before the introduction of the newly added Audio Output sensors (see #1978). In addition, both Audio Output sensors also do not recognize the use of the Bluetooth device. However, the Bluetooth device is shown in the attributes "All Audio Input" and "All Audio Output" of both "Active Audio Input/Output" sensors.

To Reproduce
Check the sensor values in Home Assistant Companion App > Preferences > Sensors.

Connect a Bluetooth audio device to the laptop that the HA companion app is running on and select this device for sound output (/ input) in Settings > Sound > Output (/ Input).

Make sure the audio device is currently in use by playing music or testing the microphone.

Expected behavior
When the Bluetooth Audio Input device is currently in use the following sensors change:
binary_sensor.audio_input_in_use is set to true
sensor.active_audio_input is set to the name of the Bluetooth Audio Input device

When the Bluetooth Audio Output device is currently in use the following sensors change:
binary_sensor.audio_output_in_use is set to true
sensor.active_audio_output is set to the name of the Bluetooth Audio Output device

Screenshots
Audio Input
MacOS settings that show AirPods Pro as selected input device:

Attribute "Active Audio Input" is not set but "AirPods Pro" is listed in "All Audio Input":

Audio Output
MacOS settings that show AirPods Pro as selected output device:

Attribute "Active Audio Output" is not set but "AirPods Pro" is listed in "All Audio Output":

Additional context
I checked the MacOS privacy settings but Home Assistant is not listed as an application that requests access to the microphone thus I do not expect this to be an issue due to missing permissions on the laptop. Additionally, audio devices that do not connect via Bluetooth to the laptop do not cause issues.

The technical feasibility of identifying if a Bluetooth device connects to the laptop has been discussed before in #1331. However, it was not transparent enough to me if this is also the reason the Bluetooth audio device's use cannot be detected properly.

[zacwest]

I believe Apple shipped some pretty bad regressions for bluetooth devices that is causing them to never become 'active'. See #1903 -- does this sound like your issue?

[T-Bendrath]

Thank you @zacwest for pointing me to a similar issue and already filing this with Apple. I didn't indeed see the other issue from Nov 4. My issue can be closed then as this is a duplicate of #1903.