KM to Reliably Recognise presence of Notification Centre

Hi everyone,
I'm completely new to the Keyboard Maestro forum (and also to Keyboard Maestro itself basically). I'm trying to create a macro group that only activates when the Notification Centre is on screen. I first tried doing this by stating Available when a focused window title is: Notification Centre, but this doesn't work. It appears I'm having more luck if I say Available when a focused window title contains: Not, but I'd prefer something more precise. How can I do this reliably?
Just for context, I'm doing this to create a macro to clear all notifications once I go into the NC by simulating mouse clicks at certain areas, but I'm not sure if this is the best way to go about this.
Any help would be much appreciated.

I have a macro that clears all notifications. See if it works for you:

Clear All Notifications.kmmacros (30 KB)

Macro screenshot