Ubuntu XFCE Shortcut problems

After installing XFCE i had multiple Problems with my hotkeys.

Every step can be added at Open Menu -> Settings -> Keyboard -> Tab Application Shortcuts.

Media Keys

Next Track

Command: dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Next Key: Press the Next Track Media key.

Previous Track

Command: dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Previous Key: Press the Next Track Media key.

Play/Pause Track

Command: dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.PlayPause Key: Press the Play/Pause Media key.

Stop Track

Command: dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Stop, Key: Press the Stop Media key.

Source : man42.net Blogpost