We are using official APIs (developers access) as much as possible to handle all music services on Soundiiz and to get your music datas and also moving your playlists and favorites to this platform.
Unfortunately, some methods like "delete" or "update" are not available with some music services APIs, that means we are no more able to delete tracks in a playlist or delete a playlist for example.
That's why you got an error 104 "Feature not available for this platform" if you are syncing with a "Replace" method or using any "Replace to" feature for example. Or when trying to delete tracks in a playlist.
It could also be impossible to update a playlist (like updating title for example) as some music services are not providing such "Update" method too.
You can found more details about our compatibily with each music services here.