Google Pixel (Android 14) as Webcam: Audio not working

[t3k0]

Hi all,

there's a new feature on Android 14, where you can use your Google Pixel phone as a webcam, when it is connected via USB to your desktop computer.

I managed to get the camera working (following the gentoo wiki), but there is no audio device detected. I assume some kernel module is missing in my config. The wiki page only mentions CONFIG_SND_USB_AUDIO, which I have loaded.
(Further, I already have another USB-audio interface connected to my computer and this device is working.)

Am I missing something? Are there any Pixel Phone users who managed to get the microphone working?

Here an excerpt from my .config (sys-kernel/gentoo-sources-6.1.57)