Not getting CloudKit silent push notifications on macOS

I have an iOS app and macOS app that sync data using CloudKit (no CoreData involved). Syncing mostly works, except that on my development machine I don't get any push notifications when other devices make changes.

For example I can make a data change on macOS and it gets pushed to my iOS app immediately, however if I make a change on iOS, the macOS app never gets a notification. I can check in CloudKit dashboard and the data has been updated, and a push was sent, but the macOS app never gets it.

The subscription is set up like so (same code on macOS and iOS) and it reports success on both platforms:

Code Block 
private func subscribeToCloudKitChanges() {
    if UserDefaults.standard.bool(forKey: ckSubscriptionStateKey) == true { return }
    
    let subscription = CKDatabaseSubscription(subscriptionID: cloudKitPrivateChangeID)
    let notificationInfo = CKSubscription.NotificationInfo()
    notificationInfo.shouldSendContentAvailable = true
    subscription.notificationInfo = notificationInfo
    
    let op = CKModifySubscriptionsOperation(
        subscriptionsToSave: [subscription],
        subscriptionIDsToDelete: []
    )
    op.modifySubscriptionsCompletionBlock = { (_, _, error) in
        if let error = error {
            logger.error("Error setting up CloudKit subscriptions: \(error.localizedDescription)")
            UserDefaults.standard.set(false, forKey: ckSubscriptionStateKey)
        } else {
            logger.log("CloudKit subscriptions created")
            UserDefaults.standard.set(true, forKey: ckSubscriptionStateKey)
        }
    }
    op.qualityOfService = .utility
    ckContainer.privateCloudDatabase.add(op)
}

The remote notifications are requested like so, and always reports that is is registered. Though oddly enough I never get the callback to say it has been registered?

Code Block 
func applicationDidFinishLaunching(_ notification: Notification) {
    NSApplication.shared.registerForRemoteNotifications()
    print("Requested remote notifications. Status: \(NSApplication.shared.isRegisteredForRemoteNotifications)")
//...

And finally, to receive the iCloud change notification:

Code Block 
func application(_ application: NSApplication, didReceiveRemoteNotification userInfo: [String : Any]) {
    guard let ckn = CKDatabaseNotification(fromRemoteNotificationDictionary: userInfo) else { return }
    if ckn.subscriptionID == cloudKitPrivateChangeID {
        DispatchQueue.main.async {
            self.cloudKitPrivateDBChanges.send(ckn)
        }
    }
}