Sensorkit - Troubleshooting SRErrorDataInaccessible in Background Fetch with SensorKit

Hello,

I am currently developing an iOS application using SensorKit. I encountered an issue when attempting to fetch SensorKit data in the background using background tasks (appRefresh, processing). The following error occurs:

In the delegate function func sensorReader(_ reader: SRSensorReader, fetching fetchRequest: SRFetchRequest, failedWithError error: any Error) {}, I receive the error: SRErrorDataInaccessible.

In code specific manner:

start and handle background fetch (appRefresh)

func handleAppRefreshTask(task: BGAppRefreshTask) {
    logger.logWithServer(level: .default, message: "background fetch start", category: String(describing: BackgroundTaskManager.self))
    
    scheduleBackgroundFetch()
    
    let queue = OperationQueue()
    queue.maxConcurrentOperationCount = 1
    
    let fetchOperation = FetchOperation()
    queue.addOperation(fetchOperation)
    
    task.expirationHandler = {
      self.logger.logWithServer(level: .error, message: "background fetch expirated", category: String(describing: BackgroundTaskManager.self))
      queue.cancelAllOperations()
    }
    
    fetchOperation.completionBlock = {
      task.setTaskCompleted(success: !fetchOperation.isCancelled)
    }
  }

Background fetch operation class

class FetchOperation: Operation {
  override func main() {
    guard !isCancelled else { return }
    Task {
      // this function will execute fetch request for all user allowed sensorReader, 'func fetch(_ request: SRFetchRequest)'
      await SensorkitManager.shared.startFetchAndUpload()
    }
  }
}

I have the following questions:

1. Is it possible to fetch SensorKit data in the background?
2. If it is possible, why does the above error occur?
3. If it is possible, could you provide the solution code and the correct workflow to avoid this error?

Thank you.