Playlists half grey and unplayable / undownloadable on mobile - fine on PC

[Wesley2scoops]

Half of one of my old playlists is now grey and unplayable / undownloadable on my mobile (android) but is still fine on my PC and imac.

The list is a shared list, and the songs in grey were all added from a different account (also mine) but not all of the songs from that account are grey so it isn't universal. 

Is there anything I can do to restore the playlist? I have never used Spotify internationally, and have tried uninstalling and reinstalling Spotify.