Just tested switching mic using the Control Center in iOS 26, and that works! I noticed the new AVInputPickerInteraction in iOS 26, which looks promising, but there is a slight catch. My app is a streaming app, and users would like to switch mic automatically when switching "scene/camera". It's not suitable to present a picker every time that happens, so would be awesome if the mic selection could be done in code (in Swift).

I got it working after copying all sample buffer metadata. Somehow it must have been modified somewhere in my code and that occasionally made recording break.