Apple Music

Get help with iCloud Music Library - Apple Support

• If you can’t see iCloud Music Library on your iPhone, iPad, or iPod touch

First, restart your iOS device. 

If you still can't see it after the restart:

1. Turn off iCloud Music Library and then turn it back on.

2. Sign out of the iTunes Store and then sign back in.

Unhiding these in iTunes:

Perhaps these have become hidden purchases? To see if that is the case, unhide them.