she is not recognizing me when i say hey cortana...my microphone is on and everything is working great but still i have to click on the icon to talk to cortana i have also tried with learn my voice but still it is not working..plz help ..my region is basically Pakistan but due to it does not offer in my country so i have changed my region to US and my language is US too ,so it works fine but not answering me when i say hey cortana..plzzz help me solve the problem