Hey @detpt, welcome to the Community.
Hope you are having a great time!
It seems that you have reached the limit of 3333 downloaded songs and that is up to 3 devices simultaneously. You will need to remove some old songs from your downloaded songs in order to let these new songs to be downloaded in your device.
Please read this article for more about that.
Have a nice day 🙂
LoxerRock Star 16
Help others find this answer and click "Accept as Solution".
If you appreciate my answer, maybe give me a Like.
Note: I'm not a Spotify employee.
