I run task service-start and it seems to work, but I don't see a background process started.
I then create a remind task to fire in a few minutes, but I don't get a notification (via dunst).
If I run notify-send, I get a notification popup from dunst, so I know notifications are working.
I'm on Fedora 35.
I found that it appears to be hard coded for task to be installed in /usr/local/bin/task.
Apparently it is expecting something in Gnome to auto start it on login?