I finally got it to work. I had to add the playlist to my sonos favorites and change some commands.
[{"id":"55a48b98b63fd816","type":"tab","label":"Flow 2","disabled":false,"info":"","env":[]},{"id":"ba1154d844dfe40b","type":"sonos-universal","z":"55a48b98b63fd816","confignode":"8c8a29e41e894551","command":"player.set.volume","state":"3","stateType":"str","avoidCheckPlayerAvailability":false,"name":"","x":450,"y":140,"wires":[["162b294b3abc1386"]]},{"id":"c30e9e9488503787","type":"inject","z":"55a48b98b63fd816","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":160,"y":140,"wires":[["ba1154d844dfe40b"]]},{"id":"0573d9e723991a0f","type":"sonos-manage-mysonos","z":"55a48b98b63fd816","confignode":"8c8a29e41e894551","command":"mysonos.queue.item","state":"Wake Up Happy","stateType":"str","avoidCheckPlayerAvailability":false,"name":"","x":860,"y":140,"wires":[["c83dfc6869137402"]]},{"id":"162b294b3abc1386","type":"sonos-universal","z":"55a48b98b63fd816","confignode":"8c8a29e41e894551","command":"group.clear.queue","state":"","stateType":"str","avoidCheckPlayerAvailability":false,"name":"","x":650,"y":140,"wires":[["0573d9e723991a0f"]]},{"id":"c83dfc6869137402","type":"sonos-universal","z":"55a48b98b63fd816","confignode":"8c8a29e41e894551","command":"group.play.queue","state":"","stateType":"str","avoidCheckPlayerAvailability":false,"name":"","x":1090,"y":140,"wires":[[]]},{"id":"8c8a29e41e894551","type":"sonos-config","name":"Sonos Schlafzimmer","serialnum":"78-28-CA-B7-21-5C:0","ipaddress":"192.168.178.31"}]
Thanks for your help anyways.