You need a Spotify Premium or Premium for Family account to use Jooki. If you use multiple Spotify accounts with Jooki, for instance in the case of different members of the family under a Premium for Family subscription, you may wonder which account is being used by your Jooki device.
Let's assume you have already linked a Spotify playlist to a character. You place that character on Jooki and the playlist starts playing, all good. What happens behind the scenes is that Jooki logs into Spotify so that it is authenticated to play.
Now, which credentials are used? Right now, these are the credentials of the last Spotify user that connected to Jooki.
Ok, so what? If you use a single Spotify Premium account you won't care. But if you are using Premium for Family (or multiple Premium accounts) and you want to reserve one of these accounts to Jooki so that the kids don't interrupt your own playlist. Just make sure that the last Spotify account to log into Jooki is the one you reserved for the kids and everybody will be happy.