Hi @equalizer81, thank you for reaching out to the Sonos community. I appreciate your detailed post describing the issue as well as the steps that you did. Let me help you with this.
I'd like to ask a few questions and will give some suggestions on what you can follow.
- Is the sync turn on from your iOS device?
- On your iOS device, go to Settings > Music > Turn on Sync Library
- Do you see the same imported playlist on other mobile devices?
- Have you tried removing and re-adding Apple Music? Did it work?
If you're still having the same issue after checking the steps above, I recommend contacting our Sonos Customer Care support to remotely connecting to your device to further assist you on this and to provide the best option for you.
Please feel free to reach out in the future if you have any other questions.
You're always welcome here.