No logging with mpDris2
I run mpd locally and use mpDris2 (https://github.com/eonpatapon/mpDris2) to generate notifications of song changes. This works in that I do get a notification bubble when a song changes. However, nothing is captured and logged by xfce4-notifyd and mpDris2 (or mpd) do not show up in the known applications list.
It looks like mpDris2 queries org.freedesktop.Notifications to get the provider service and sends the info to it. In my case, the provider is xfce4-notifyd.
Querying the sqlite database via "select * from notifications;" returns a list but does not include mpDris2 or mpd.
Let me know if you need more info.