Some titles not available on one device, but available on another

[Philliphommel]

Plan

Free/Premium

Country

Device

(iPhone 8, Samsung Galaxy 9, Macbook Pro late 2016)

Operating System

(iOS 10, Android Oreo, Windows 10,etc.)

My Question or Issue

Hi Guys

I have a Premium Account, we use Premium family. On my Kids' android device there are many titles not available (audiobooks for children by several German authors, example "die playmos - rettet den dinopark" ). While on my device I have all titles available, with my Account as well as with my sons', on the kid's device most playlist can play like the first and last title of the Album/playlist with my sons' Account (all I there titles are in a dark font and won't play) , While with my Account all titles are available. Songs are not tagged explicit, but I even enabled explicit content both in spotify and google family link and tried several playlist. Rebooted the device, logged in and out etc. Just won't play all titles on kids' device with kids' account. 

It's German playlists, Regional settings germany, we are in germany at current