Swift Background task not triggering [duplicate]

Since some time I have tried to use background tasks in Swift: https://developer.apple.com/documentation/backgroundtasks

But for some reason I cannot get it working. I do not use simulator but build directly to my device. Iam using SwiftUI but to get it working I have enabled AppDelegate to handle the background tasks like visible below.

class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        
        let taskId = "co.echonova.LemonAppIos.fetchGps"
        
        // Handler for the task. My assumption is that it will print "Task did run". Also debugger does not enter this method.
        BGTaskScheduler.shared.register(forTaskWithIdentifier: taskId, using: .main) { task in
            print("Task did run")
            task.setTaskCompleted(success: true)
        }
        
        // Check if there are pending tasks.
        BGTaskScheduler.shared.getPendingTaskRequests { request in
            print("\(request.count) BGTasks pending..")
        }
        
        // Schedule the task
        do {
            let newTask = BGAppRefreshTaskRequest(identifier: taskId)
            newTask.earliestBeginDate = Date().addingTimeInterval(10)
            try BGTaskScheduler.shared.submit(newTask)
            print("scheduled")
        } catch {
            print("failed to schedule")
        }

        return true
    }
}

But for some reason the task never get executed. The terminal shows:

1 BGTasks pending..
scheduled

My expectation is that the terminal should print after ten seconds

1 BGTasks pending..
scheduled
Task did run

Any idea why this does not happen? I have tried a lot already but did not get it working.