If you are not seeing your playlists or favorites elements once transferred with Soundiiz to Apple Music, you probably forgot to enabled "iCloud Music Library" in your Apple Music app settings.
have to reload the cache of your Apple Music application.
For that, open Apple Music application in your device, go to your library and try one of this:
- Create a new playlist manually
- Rename a playlist
- Delete a playlist
- Add/Delete favorite elements
After that you will be able to see whole transfer made by Soundiiz.