Hi there,
thanks already.
Today I finally managed to find one of those machines before one of my colleagues updated them anyway and started the trace-log as above. Trace gave me the following line:
08.02.2018, 13:12:48.037: [Notification Manager] Unable to send notification with identifier 'WINDOWS_UPDATES_AVAILABLE', the non-repeating notification already exist.
But no notifications are there. (Or at least visible).
Some months ago we had a database crash on our pulseway server. At the time it seemed we had gotten it running again, might it be that something could be causing the issue there?
Addendum:
I looked into the database on the pulseway server and
select * from "Notifications" where computerIdentifier='f5456he55-aec8-462e-9331-5f1f55dfbd3b' and notificationIdentifier='WINDOWS_UPDATES_AVAILABLE';
returns one entry, interestingly nearly exactly a year old.