Can't play some tracks on iPhone

[Fifi97]

I've tried to sync my itunes library from spotify on my computer in a playlist to my iPhone but there are some tracks now that are greyed out! Maby because the iPhone can't find them on Spotify but I can listen to them on spotify on my computer too!!

I also marked the playlist on my computer as "offline available" because the mobile app said that ,but I still can't play them!

Pls Help

[Liam]

Are they your own tracks?

If not, it is possible that the rights holders for the tracks have selected to not make them available on mobile.

[Fifi97]

No they aren't ,but I can listen to them on computer an there are tracks like titanium in it that are on spotify too.

[Fifi97]

Maybe they are grey because Spotiy can't find exactly some of their names but can I only play tracks that are on Spotify on my mobile?? Nothing else from itunes or something else or with an unknown name??