Environment: iPhone 13 Pro, iOS 26.5. Affects a single user out of many; cannot reproduce on any of our test devices.
We use HKStatisticsCollectionQuery to read step counts for a statistics screen. For one specific user, the query's initialResultsHandler appears to deliver results == nil (the success branch never runs), so our completion is never called and the screen shows an infinite spinner.
private let store = HKHealthStore()
func fetchHourlyStepCounts(for day: Date, completion: @escaping ([Int]) -> Void) {
guard let stepType = HKQuantityType.quantityType(forIdentifier: .stepCount) else { return }
let calendar = Calendar.current
let startOfDay = calendar.startOfDay(for: day)
var hourly = DateComponents()
hourly.hour = 1
let query = HKStatisticsCollectionQuery(
quantityType: stepType,
quantitySamplePredicate: nil,
options: .cumulativeSum,
anchorDate: startOfDay,
intervalComponents: hourly
)
query.initialResultsHandler = { _, collection, error in
guard let collection else {
// For the affected user, execution seems to reach here (collection == nil).
// Adding logging of the HKError + authorization status for the next occurrence.
return
}
var counts: [Int] = []
let end = calendar.date(byAdding: .day, value: 1, to: startOfDay)!
collection.enumerateStatistics(from: startOfDay, to: end) { stats, _ in
let steps = stats.sumQuantity()?.doubleValue(for: .count()) ?? 0
counts.append(Int(steps))
}
DispatchQueue.main.async { completion(counts) }
}
store.execute(query)
}
What we've confirmed / ruled out:
Read authorization for stepCount is granted (the user toggled it ON in the HealthKit sheet on video).
The Apple Health app shows step data for this user (so data exists).
A coarser query (2-year interval) for the same user succeeds, while the hourly query appears to fail — same type / predicate / options / auth.
Symptom persists across app reinstall and device reboot, and re-granting Health permission.
Permission denial returns empty results (per Apple docs), not an error — so this isn't simple denial.
Not errorDatabaseInaccessible as far as we can tell (foreground, device unlocked).
Questions:
What can cause HKStatisticsCollectionQuery.initialResultsHandler to return results == nil (with an error) persistently for one device/account, when read auth is granted and data exists?
Can errorHealthDataRestricted occur without an MDM/supervised profile (i.e., on a normal consumer device)? What device/account states actually trigger it?
Is it expected that a coarse-interval query succeeds while an hourly-interval query on the same type fails for the same user?
We're adding logging of the actual HKError code + authorizationStatus for the next occurrence, but would appreciate any insight on what conditions produce this.
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