Xcode – Trying to use BGAppRefreshTask and getting error No task request with identifier <decode: missing data> has been scheduled

I kept getting the error

No task request with identifier <decode: missing data> has been scheduled

in my debugger output so I decided to try running the example code provided by Apple here and got the same error. I’ve tried multiple computers and Xcode versions, multiple example projects from different sources and nothing has worked.

My AppDelegate.swift file:

import UIKit
import Firebase
import BackgroundTasks

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        FirebaseApp.configure()
                
        BGTaskScheduler.shared.register(forTaskWithIdentifier: “redacted.identifier”, using: nil) { task in
            self.handleAppRefresh(task: task as! BGAppRefreshTask)
        }
        
        return true
    }
    
    func applicationDidEnterBackground(_ application: UIApplication) {
        BGTaskScheduler.shared.cancelAllTaskRequests()
        scheduleAppRefresh()
    }
    
     func scheduleAppRefresh() {
        let request = BGAppRefreshTaskRequest(identifier: "redacted.identifier")
        
        request.earliestBeginDate = Date(timeIntervalSinceNow: 60)
        do {
            try BGTaskScheduler.shared.submit(request)
        } catch {
            print("Could not schedule app refresh: (error)")
        }
    }
    
    func handleAppRefresh(task: BGAppRefreshTask) {
        scheduleAppRefresh()
        
        let db = Firestore.firestore()
        
        db.collection("devices").document(UIDevice.current.identifierForVendor!.uuidString).setData([
            "batteryLevel": UIDevice.current.batteryLevel*100
            ]) { err in
            if let err = err {
                print("Error writing document: (err)")
            } else {
                print("success")
                task.setTaskCompleted(success: true)
            }
        }
        
        task.expirationHandler = {
            task.setTaskCompleted(success: false)
        }
    }

I am testing background fetch by running

e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWithIdentifier:@"redacted.identifier"]

in the Xcode console, after which the error above occurs.

Console output:

Simulating launch for task with identifier redacted.identifier

No task request with identifier <decode: missing data> has been scheduled