I have written this code within my automations.yaml file, saved it and rebooted the RPi that my HA is running on, why does the Automation not show up within my Configuration / Automations page? 
I am not sure if I have got the syntax wrong, or something else is preventing it from “running” …
TIA
- id: '1603995851450'
alias: Kitchen Sonos ( On, 07:00)
description: ''
trigger:
platform: time
at: 07:00
condition: []
action:
- service: media_player.turn_on
entity_id: media_player.kitchen
- service: media_player.volume_set
entity_id: media_player.kitchen
volume_level: 0.2
- service: media_player.play_media
entity_id: media_player.kitchen
media_content_id: https://www.bbc.co.uk/sounds/play/live:bbc_radio_fourfm
media_content_type: channel
mode: single