Notifications not being catched when using notify-send

[Thomas]

I am using notify-send to display some messages from a cron script. In a shell I can execute notify-send and the message is displayed. But when a message is sent from a daemon script it is displayed but does not go into the notification queue of xfce4.
To see the queue I use the notification panel plugin which can store a log of last notifications. Only notifications in a shell are stored there, but no other notifications.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: xfce4-notifyd 0.6.3-1
ProcVersionSignature: Ubuntu 5.15.0-56.62-lowlatency 5.15.64
Uname: Linux 5.15.0-56-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Wed Dec 7 16:37:23 2022
InstallationDate: Installed on 2019-12-19 (1084 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: xfce4-notifyd
UpgradeStatus: Upgraded to jammy on 2022-04-07 (244 days ago)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2022-04-09T11:41:02.383904