Thanks for reaching out to us and welcome to the Community 🙂
It's a good idea to open the app on both devices, while being logged in to your account. That way any changes can sync up. It's also important that the devices are connected to the same WiFi network. Then you can give these steps a go.
If you can't see the song in the playlist on your phone, you can turn on "Show unavailable songs in playlists".
Hope this helps. If you have questions, you know where to find us.
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"Difficult roads often lead to beautiful destinations." ―Zig Ziglar