Why isn’t the queryDyskineticSymptom callback executing after calling monitorKinesias in Swift?

I'm a beginner in Swift and I'm developing an app for Parkinson’s disease research. I have the necessary entitlements and plist configurations set up correctly, yet I'm not seeing any results from my movement disorder monitoring.

I call the monitoring function when a button is pressed:

SWIFTCopied
movementDisorderManager.monitorKinesias(forDuration: 60.0 * 60.0 * 24.0 * 7.0)

To debug, I created the following test function to print the output to the console:

SWIFTCopied
func testFunc()
{
    if CMMovementDisorderManager.isAvailable() {
        print("Movement disorder monitoring is available.")
    } else {
        print("Movement disorder monitoring is not available on this device.")
    }

    let status = CMMovementDisorderManager.authorizationStatus()
    print("authorization status: \(status)")
    if status == .authorized {
        print("authorizatized.")
    } else {
        print("unauthorizatized.")
    }

    previousDate = Date().addingTimeInterval(-10800) // 3 hours ago

    guard let endDate = movementDisorderManager.lastProcessedDate() else {
        print("lastProcessedDate is nil")
        return
    }

    print("from: \(previousDate) to: \(endDate)")

    // Query tremor data
    movementDisorderManager.queryDyskineticSymptom(from: previousDate, to: endDate) { (tremorResults, error) in
        print("line 190")
        if let error = error {
            print("Error querying tremor data: \(error.localizedDescription)")
            return
        }

        print("count: \(tremorResults.count)")

        for result in tremorResults {
            print("Tremor Result: \(result)")
        }
    }
}

The console output is as follows:

PLAINTEXTCopied
Movement disorder monitoring is available.
authorization status: CMAuthorizationStatus(rawValue: 3)
authorizatized.
from: 2025-01-28 11:55:02 +0000 to: 2025-01-28 14:52:00 +0000

I’m not seeing any further output – no "line 190", no count, and no tremor results. What could be causing the query callback to not execute?