Cortana has never worked without intervention other than on day 11. Every other day (today is day 13 of my Windows 10 experience) it has required some manipulation (here is my experience so far). During this time I have made no changes to the system settings other than whatever Microsoft pushes with its updates, and one Nvidia driver update.
The latest is the experience I had on the evening of day 7 and day 12, and my instincts tell me that this is Cortana’s latest behaviour.
I have two microphones: one built in to my webcam (the default) and an external headset with mic. Cortana does not respond on start-up until I plug in the headset and then pull it out. Only then does Cortana hear me through the webcam.
No other program requires this: they all work as they always did.
The webcam mic is the default.
How do I get Cortana to recognize the microphone the same way as every other program (Skype, Audacity) does?