Why does a microphone icon appear on the target device when using the View360 (live microphone) feature?

The microphone icon is a Privacy Indicator introduced in Android 12 and later. It is an Android OS security feature that appears whenever any application accesses the microphone or camera — it is not specific to TheOneSpy. This indicator cannot be disabled without rooting the target device. If the device is rooted, the Privacy Indicator can be hidden.