Groove Music Issues

[EMINENT 1]

For me, after the UWP update, no syncing happens between my pc where my main files are synced and stored with Onedrive to my client devices like my SP4 or 950xl.

Playlists do not update. Sync button ends with - couldn't sync. Been trying for hours on end and even logging out of my MS acct. and restarting devices.

Syncing is completely broken and has rendered Groove useless.