When trying to transfer playlists to Amazon Music or create a new playlist in Amazon Music with Soundiiz; you could have an error message, often with code error 304.
Important: Only "paid" members of Amazon Music can create personal playlists on Amazon Music. Free-tier users of Amazon Music can't create such playlists and will get an error while trying to convert playlists to Amazon Music with Soundiiz.
Even if you are a paid subscriber to Amazon Music, be aware that this could happen from time to time and it's mostly not an issue with the title of your playlist or special characters. But simply a temporary issue with the Amazon Music API.
We recommend you try again later. If still not working, that may be an issue with your Amazon Music account; nothing can be done on our side at this point. We recommend you reach Amazon Music support to see why there's such an issue with your Amazon Music account and the Amazon Music API.
Thank you for your understanding.