I have an LG smart TV (UH6350) as well and none of my playlists are showing in the Spotify app on the TV. The only playlist that shows up is the "Starred" playlist, but it says that there's 0 songs in it when I actually have at least 40 songs in that particular playlist. I tried adding a song to that playlist on the TV like previous replies mentioned, but it didn't work. I still don't have any of my playlists, but I just have the "Starred" playlist with 1 song in it now. I normally love Spotify and I'm a Premium subscriber, but this is extremely frustrating.
I have LG TV and I can not see my library and some playlists. It is always say loading loading.... Oftenly Spotify stop and can not do anything. I can not see my friends and I can not see weekly discover playlists and I can not search anything. What kind of premium service is this? I am paying for 2 people for 2 years to Spotify. But If this problem does not fix, I will cancel my premium account. That is enough!!!