Thank you for your quick reply, Jack!
Interestingly, I have issues to trigger it if I change the post status of the custom post type on either the front-end or the admin back-end.
I just tested the notification with the standard post type and it works well.
EDIT:
Sorry for wasting your time, I just noticed in another support question, that i must have overseen a setting. I did not scroll through to the custom post type notifications. In case it is possible, you may increase the size of the scroll window, so that specialist like me have a higher chance of finding the custom post types. Or alternative make two menu items out of it.
Awesome plugin.