I've taken a bit of case to debug my xfce issue where I'm using notify-osd and it might be a different problem
What's the output of
$ gdbus call --session --dest org.freedesktop.Notifications --object-path /org/freedesktop/Notifications --method org.freedesktop.Notifications.GetCapabilities
in your environment?
In the notify-osd case it's missing the 'action' capability which was the problem but I expect that's probably not the case under KDE
I've taken a bit of case to debug my xfce issue where I'm using notify-osd and it might be a different problem
What's the output of
$ gdbus call --session --dest org.freedesktop .Notifications --object-path /org/freedeskto p/Notifications --method org.freedesktop .Notifications. GetCapabilities
in your environment?
In the notify-osd case it's missing the 'action' capability which was the problem but I expect that's probably not the case under KDE