Premier thinks it doesn't have permission to use microphone.
Windows 10
The Voice Over icon is disabed on the timeline.
I used the timeline display settings to customize the audio header (dragged the microphone ico to the audio header).
I've used Edit->Preferences->Audio hardware to set the default input device.
Premier Pro has permissions to use the microphone. You can see all that in the screen shot below. In fact, Windows System Preferences->Micropone says microphone is currently in use by Adobe Premier Pro.
The microphone tests ok in Windows Device properties input device test.

