Polybar tray not recognized as tray.target by systemd

I am running a window manager (bspwm & polybar) and am trying to run a couple of systemd services (network-manager-applet and udiskie), but both complain as follows:

Failed to start network-manager-applet.service: Unit tray.target not found.

Polybar does have a built-in systray, and it is working just fine for blueman-manager and variety. Is there a way to get network-manager-applet and udiskie to work with polybar?

Try installing pkgs.polybarFull

That’s the one I am using.