How do I access total ascent or total elevation gain?

[justingshreve]

Can someone please point me in the right direction on how to grab total ascent for a workout or run with iOS? I'm using getAnchoredWorkouts and the following is returned, but HKElevationAscended is always null. I also tried using the activity id and grabbing getWorkoutRouteSamples, but that returns array of locations. I tried to calculate elevation gain by iterating through location array items, but it never matches what is displayed within native iOS app. I'd like to use this value for any relevant activity.

{
    "activityId": 52,
    "activityName": "Walking",
    "calories": 120.67933942061691,
    "device": "Watch6,18",
    "distance": 1.2135681415010504,
    "end": "2023-05-23T18:11:12.187-0400",
    "id": "C0F19235-CDC1-445F-9D78-C2367AFC2586",
    "metadata": {
        "HKAverageMETs": null,
        "HKElevationAscended": null,
        "HKIndoorWorkout": 0,
        "HKTimeZone": "America/New_York",
        "HKWeatherHumidity": null,
        "HKWeatherTemperature": null
    },
    "sourceId": "com.apple.health.66B51901-670B-4A20-A56A-EAC8559D15B2",
    "sourceName": "Apple Watch",
    "start": "2023-05-23T17:54:31.083-0400",
    "tracked": true
}