Siri not working under MacOS Sierra [Fix]
It is simply to fix if Siri does not work after upgrade to MacOS Sierra. How to solve the problem?
Firstly, you have to make sure the Microphone is activated. From the Siri dialog box, click on the Microphone to enable it.
After that, if the situation remains the same, just simply disable then enable the Siri. This should fix the problem.