Hi everyone! I have created an app to save & read some running & walking workout data to HealthKit. I managed to save the data, and view it on the simulator's Health app, but when I try to read the data, sample count is 0. I'd appreciate if someone help me out with this. Thanks in advance! Xcode 12.5.1 / iOS 14.5 func AuthenticateHealthKit() { print("AuthenticateHealthKit") let typesToShare: Set = [ HKQuantityType.workoutType() ] let typesToRead: Set = [ HKQuantityType.workoutType(), HKQuantityType.quantityType(forIdentifier: .distanceWalkingRunning)!, HKQuantityType.quantityType(forIdentifier: .height)!, ] healthStore.requestAuthorization(toShare: typesToShare, read: typesToRead) { (success, error) in if !success { fatalError("Error requesting authorization from health store: \(String(describing: error)))") } else { print("Authenticated!") } } } func SaveData() { let configuration = HKWorkoutConfiguration() configuration.activityType = .running configuration.locationType = Int.random(in: 0..<2) == 0 ? .indoor : .outdoor let startDate = now - (86400 * 60.0) let duration = 120.0 let endDate = startDate + duration let quantity = HKQuantity(unit: HKUnit.kilocalorie(), doubleValue: 20.0) let distance = HKQuantity(unit: HKUnit.meter(), doubleValue: 1200) let workout = HKWorkout( activityType: configuration.activityType, start: startDate, end: endDate, duration: duration, totalEnergyBurned: quantity, totalDistance: distance, metadata: [HKMetadataKeyIndoorWorkout: true]) healthStore.save(workout) { success, _ in if success { print("SAVED WORKOUT!!!") } else { print("COULD NOT SAVE WORKOUT!!!") } } } func ReadData() { let start = now - (86400 * 60.0) let end = now let predicate = HKQuery.predicateForSamples(withStart: start, end: end, options: []) print("start : \(start)") guard HKHealthStore.isHealthDataAvailable() else { print("No data available!") return } guard let sampleType = HKSampleType.quantityType( forIdentifier: HKQuantityTypeIdentifier.distanceWalkingRunning) else { fatalError("*** This method should never fail ***") } let query = HKSampleQuery( sampleType: sampleType, predicate: predicate, limit: Int(HKObjectQueryNoLimit), sortDescriptors: nil ) { query, results, error in guard let samples = results as? [HKQuantitySample] else { print("Error") return } for sample in samples { print("sample : \(sample.quantity) \(sample.quantityType)") } DispatchQueue.main.async { print("Update UI : \(samples.count)") } } healthStore.execute(query) } Output of ReadData method start : 2021-08-14 21:38:35 +0000 Authenticated! Update UI : 0 Following are the Health App data & permissions (all on simulator)