My Spotify suddenly not working on my Apple Watch series 7, I closed the Spotify app and turned off my watch. After restarting, it still has no response. Finally, my sister share a Spotify Music Converter to me. It is able to download and convert Spotify plsylist to MP3, M4A, FLAC, WAV at 320kbps quality. Now I can play Spotify music on Apple Watch with a phone. Here’s the simple guide you can follow:
First, launch the Spotify converter like TunesBank, and login to your Spotify account on Spotify web player.
Then drag any song or playlist to the + icon. Choose output format (M4A/MP3/FLAC/WAV) and adjust output quality.
Hit on Convert button. After that, transfer the songs to smartphone, then sync to your Apple Watch.
And you can listen to Spotify on Apple Watch without having your phone.
I’ve had this situation before. Indeed, the best solution is to download Spotify music and transfer to Apple Watch. I am using UkeySoft Spotify Music Converter, it allows me to download Spotify music as MP3, M4A and other popular audio formats. After downloading, I can transfer Spotify music files to my Apple Watch SE successfully.
Thank you for sharing this! Now I have other options to do. I also used AudFun spotify music converter to convert Spotify tracks to to MP3. Fast speed! Super easy-to-use interface! 
This has been bothering me for a long time. So when I fix this issue with DRmare Spotify Music Converter, you can imagine how grateful and excited I am. It’s the best way to listen to Spotify music offline, and you will never meet that problem again.
I had the same issue, so I transffered my playlist to Apple with the help of Musconvtool.
Same issue also. Luckily, AudFree Music Converter for Spotify help me go through this! What an amazing program! So user-friendly!
It’s annoying when Spotify not working on Apple Watch. However, it happens occasionally and has existed for a long time. Usually, I use Tunelf Spotify Music Converter to download Spotify music to mp3 and then transfer them to Apple Watch for offline listening. Tunelf offers Spotify Music Converter for Windows and Mac, which enables us to do this setup on more devices.
si no tienes una idea sobre cómo usar Spotify en Apple Watch, puedes probar ver este artículo: Descargar Musica de Spotify en Apple Watch - Tunelf