Just installed iOS 18 Beta 3. I am seeing my AccessibilityUIServer using the microphone and this is causing no notification sounds, inability to use Siri by voice and volume is grayed out.
If I start to play anything with sound AccessibilityUIServer releases the microphone and I am able to use the app.
Calls still work since AccessibilityUIServer will release and the phone will ring.
Feed back ID is FB14241838.