When handling background actions like receiving a notification, the isolate that runs in the background may not have direct access to your providers, which are initialized in the main isolate. To solve this issue and play audio in the background using Riverpod, you can follow these steps:

1. Enable background usage of flutter_local_notifications and just_audio_background

2. Configure the background Isolate to run the necessary code

3. Alternative: Using a Background Service: If the logic you need to run is more complex or if you need to handle more shared state, you can implement a background service that maintains the application state or uses just_audio_background directly. This approach is a bit more complex but gives you more control over background audio playback.