For anybody still using Microsoft’s Groove Music app (really!) the time has come to find another solution. March 31st music streaming via the Groove Music app will stop working. Sometime ago Microsoft killed the music subscription part of Groove music but you could stream your own music collection stored on OneDrive but that is going to end soon as well.
You will still be able to listen to your personal music collection download locally or use the OneDrive web player. Music stored in OneDrive will stop syncing with your device 31/03/2019 and the cached data will be deleted 30 days after that.
More details on Microsoft’s support document.