Desktop notifications from Systemd Service

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I set it up as a user service and after removing the specified user, it works like this:

      services."notify" = {
        script = ''
          ${pkgs.libnotify}/bin/notify-send --urgency=critical "Systemd Service has failed"
        '';
        environment = {
          # USER = "sperber";
          # HOME = "/home/sperber/";
          # Display = ":0";
          # DBUS_SESSION_BUS_ADDRESS = "unix:path=/run/user/%U/bus";
          # DBUS_SESSION_BUS_ADDRESS = "unix:path=/run/user/1000/bus";
          # XAUTHORITY = "/home/sperber/.Xauthority";
        };
        serviceConfig = {
          Type = "oneshot";
          # User = "sperber";
        };
      };