Querying for vo2Max in HealthKit?

Question

At WWDC 2017 Apple announced the addition of vo2Max as new quantity sample. What variables must be in place in order to return vo2Max samples? Per the Health App under Vo2Max "Apple Watch Records your predicted vo2Max when you do a rigorous outdoor walk or run in the Workout app for at least 20 minutes with a persistent heart rate measurement." Which sounds as though it is not available to 3rd party apps, however this clip at WWDC 2017 at 3:20 makes it sounds as though it should be available?

The below code during a .running outdoor workout returns and empty array even after 20 minutes:

func startVO2MaxQuery(from startDate: Date, updateHandler: @escaping ([HKQuantitySample]) -> Void) {
        let typeIdentifier = HKQuantityTypeIdentifier.vo2Max
        startQuery(ofType: typeIdentifier, from: startDate) { _, samples, _, _, error in
            guard let quantitySamples = samples as? [HKQuantitySample] else {
                print("Heart rate query failed with error: \(String(describing: error))")
                return
            }
            print("VO2Max samples = \(quantitySamples)")
            updateHandler(quantitySamples)

        }
    }



 private func startQuery(ofType type: HKQuantityTypeIdentifier, from startDate: Date, handler: @escaping
        (HKAnchoredObjectQuery, [HKSample]?, [HKDeletedObject]?, HKQueryAnchor?, Error?) -> Void) {
        let datePredicate = HKQuery.predicateForSamples(withStart: startDate, end: nil, options: .strictStartDate)
        let devicePredicate = HKQuery.predicateForObjects(from: [HKDevice.local()])
        let queryPredicate = NSCompoundPredicate(andPredicateWithSubpredicates:[datePredicate, devicePredicate])

        let quantityType = HKObjectType.quantityType(forIdentifier: type)!

        let query = HKAnchoredObjectQuery(type: quantityType, predicate: queryPredicate, anchor: nil,
                                          limit: HKObjectQueryNoLimit, resultsHandler: handler)
        query.updateHandler = handler
        healthStore.execute(query)

        activeDataQueries.append(query)
    }

permissions

 private func requestAccessToHealthKit() {
let healthStore = HKHealthStore()

let allTypes = Set([HKObjectType.workoutType(),
                    HKSeriesType.workoutRoute(),
                    HKObjectType.quantityType(forIdentifier: .activeEnergyBurned)!,
                    HKObjectType.quantityType(forIdentifier: .heartRate)!,
                    HKObjectType.quantityType(forIdentifier: .vo2Max)!,
                    HKObjectType.quantityType(forIdentifier: .stepCount)!,
                    HKObjectType.quantityType(forIdentifier: .distanceWalkingRunning)!])

healthStore.requestAuthorization(toShare: allTypes, read: allTypes) { (success, error) in
    if !success {
        print("failed HealthKit Authorization from iPhone \(String(describing: error?.localizedDescription))")
    }

    print("Successful HealthKit Authorization directly from the watch")
}

}

Is there anything else I need to do? Apple's documentation is pretty sparse.