I have to start Spotify on my PS4 and start playing something or it won't show up on *any* of my devices (two Androids--7 and 6--and one Chromebook--Web App).
Hey @Egingell! Welcome to the Spotify Community. ^^
Are you still not seeing your Playstation on your other devices?
If yes, please try to check if you're logged into the same account on all of your devices. It can also help if you check if some of your devices are currently in the 'Offline Mode'. ^^