If you want to play music on your streams, find and play music that you have the rights to broadcast, from a service that allows you to do so. Spotify does NOT allow you to do this.
Spotify’s ToS prohibits you using their service to redistribute (such as by streaming) their content. Doesn’t matter if the content is listed as “non DMCA”, Spotify itself does not allow for you to do that.
If you want to find specific services that are safe to use on Twitch I suggest Googling it, as this is a Developer community forum.