Hello lads,
After 30 minutes search, looking and using my 'clear' mind.
I found a solution!!
Here it is:
1. - Go and login on to your MacBook; Open iTunes.
- Open iTunes Preferences. For the shortcut Nina like me: hit CMD + ,
- Otherwise: Go to the iTunes menu; (adjacent to the Apple logo;) Then hit Preferences.
- Then turn iCloud Music Library off
- Wait about ten seconds; turn iCloud Music Library back on.
- Your Mac will now start upload all your Music. Able to see under Downloads
2. - Take your iDevice; Go to Preferences; Music
- Turn iCloud Music Library off; Turn 'Show Apple Music ' Library also off.
- Return to the Music app, when there is a song available to play, play the song.
- Go to the iTunes Store, still on your iDevice; (choose more;) then Downloads
- In my case, there was a Download 'stuck' in the Download 'heading'. No idea the song ended up there. It's probably the cause of the problem. IF it is in case, remove the download. Simply by swiping the song to the right and a remove/delete option will appear.
- Back out; close all the apps running in the background of your iPhone (multitasking); restart your iPhone.
- When you rebooted your iPhone; Open Preferences; Music; Turn iCloud Music Library on; DO NOT turn 'Show Apple Music' back on.
- Back out of Preferences; Open the Music app; your Library will the loaded; you probably won't see any difference.
- Close the Music app.
- For the final time; Go back in to Preferences; Music; Show Apple Music.
- Close Preferences
- Open the Music app; wait about 5 minutes; your library will be back to normal, with all the Apple Music Song synced.
This worked in my case, I hope it will for you too!
Regards!