Siri doesn't appear to be functioning on macOS Sierra I can't seem to get Siri to work on my 2014 Macbook Pro. I click the icon and nothing happens.

Diagnostics and Usage data just seem to barf out a bunch of com.apple.siri attributes and ends with

Siri error = 0


The system logs have the line 

Sep 21 20:44:13 baphomet com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit


Has this been seen by anyone else? If anyone knows if these point to something funny in my setup it would be greatly appreciated.
Had the same issue and found out something that solved this for me. Apparently, my notification center process was disabled for some reason, I've enabled it via terminal by typing: 

launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
killall NotificationCenter 


After that I disabled and enabled Siri via the settings menu and it seems to be working now.