Notifications

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Learn about the technical aspects of notification delivery on device, including notification types, priorities, and notification center management.

Notifications Documentation

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About Delay issues with iPhone VoIP applications
We are encountering the following issue with our VoIP application for iPhone, published on the App Store, and would appreciate your guidance on possible countermeasures. The VoIP application (callee side) utilizes a Wi-Fi network. The sequence leading to the issue is as follows: VoIP App (callee): Launches iPhone (callee): Locks (e.g., by short-pressing the power button) VoIP App (callee): Transitions to a suspended state VoIP App (caller): Initiates a VoIP call VoIP App (callee): Receives a local push notification VoIP App (callee): Answers the incoming call VoIP App (callee): Executes performAnswerCallAction() After this, the VoIP App (callee) uses "NSTimer scheduledTimerWithTimeInterval" to manage internal processing timing. However, the processing sometimes takes longer than the specified waiting time. Specifically, delays of several seconds can occur. We understood that if the user is interacting with the screen and both the iPhone and the VoIP app are in an active state, the VoIP app's processing would not be delayed. However, can significant delays (several seconds) in application processing still occur even when the iPhone is in an active state (i.e., the user is interacting with the screen)?"
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Dec ’25
How to Enable com.apple.developer.pushkit.unrestricted-voip Entitlement for Production App?
We are developing a walkie-talkie style iOS app using CallKit and PushKit for real-time voice communication. The app is intended for internal company use and requires unrestricted VoIP push capabilities to reliably deliver incoming call alerts, even in background or locked states. Our app's use case follows Apple’s guidelines, and we are not using PushKit for messaging or background data. We have already enabled "Push Notifications" in Capabilities and confirmed the provisioning profile, but are unable to enable com.apple.developer.pushkit.unrestricted-voip. Could someone from Apple or the community advise on the current process to request this entitlement for a production app? Developer Team ID: 3KX7Q4LX88 App Bundle ID: com.ksc-sys.rcc.TakumiTalk Developer Name: KOHEI TAKAOKA Company: R C C, Y.K
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127
Jun ’25
Delivery of expired voip notifications
Hello, We are facing issue that sometimes a voip notification gets delivered after it is expired. The issue can be simply demonstrated we set the device to flight mode, and after 20s we disable flight mode. We still receive the voip notification. We are setting the expiration header as following apns-expiry=0, so from my understanding it should not be delivered if the device was not able to receive the notification in the fist attempt. I have read following thread https://developer.apple.com/forums/thread/778512, from which I understand this is a long standing issue. Hence my question is, is there any way how we can notify the call kit that the call is actually no longer valid, and do not display the call to the user at all? Currently we are forced to always display CallKit call when the notification comes, and some of our users are confused that they see a missed call which they did not have any chance to pick up. Please let me know if you need any more information. Best Regards, Adam Chlupacek
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2w
APNs returning successful response for a token from an app that was uninstalled more than a month ago
We are observing an weird behaviour where a user uninstalled the app back in February (more than a month ago) but APNs is still accepting push notifications are returning success responses. We know that using APNs response codes for uninstall tracking is not reliable and that Apple will use fuzzy schedule to invalidate tokens. However, showing successful responses for month+ old tokens seems a bit misleading and results in wasted token processing for both us and Apple. Could you please confirm that invalidation (or fuzzy schedule) could take more than months to invalidate tokens on the APNs side? Is that expected or is this a bug somewhere?
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278
Nov ’25
Push Notifications and VOIP call not working.
My App supports two services that is Push Notification for Alerts and a Voip Call feature whose notification also comes in the same way as of PushNotification but video rendering is done with GoogleWebRTC. The App was working perfectly fine but from past few months these services are not working.[ Nothing is changed in App and on the server side to push the notifications] Issues: VoIP (Video call) not working: I have apns certificate which is valid in today's date and stays with the backend Server. My server sends the payload notification to APNS but on iPhone am unable to receive it. I have checked the App registration part also and is able to receive the token for the same. Framework used are: PushKit, UserNotifications, GoogleWebRTC . I don't understand where is the gap, the backend triggers the APNS but there no response. Ports enabled on server are: 443, 5223, 2197, 2195, 2196. Similarly Push notification were also not working, So I tried to change it to register on Firebase for device registration token And did some coding at backend to send the notification to that device. It was working perfectly fine from last few weeks, but it suddenly stopped. I checked the JSON Payload and tried to send it through PostMan, in both it says 200 Success. And in Application end am waiting for breakpoint to hit in userNotificationCenter(_: , willPresent, completionHandler). What all I have checked: 1)My server to APNS server connectivity. 2)Verified the apns certificate. The certificate was created in October 2024, whose expiry is in Nov 2025 and it support both Sandbox and Production environment. 3)Checked required delegates are implemented in App. With the capability enable in it, is also sending registration token to backend. Kindly guide me where I can check in this flow. Thanks in Advance!
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Jul ’25
Unable to Receive APNs Device Token in Unity iOS App Despite Proper Configuration
I’m currently developing an iOS app built in Unity, exported to Xcode for signing and deployment. The app needs to register for Apple Push Notifications (APNs) to retrieve the device token and register it with a backend service (PlayFab). Despite enabling the required capabilities and entitlements, the app never receives a device token — the authorization request succeeds, but the token remains empty (req.DeviceToken is null in Unity). I’ve confirmed that the issue occurs before PlayFab or Firebase are involved, meaning the app never receives the token from Apple Push Notification service (APNs) itself. The Unity script I am using is: #if UNITY_IOS using UnityEngine; using Unity.Notifications.iOS; using PlayFab; using PlayFab.ClientModels; using System.Collections; using System; public class iOSPushInit : MonoBehaviour { private const int MaxRetries = 5; private const float RetryDelay = 2f; // seconds void Start() { Debug.Log("🛠 iOSPushInitDebug starting..."); StartCoroutine(RequestAuthorizationAndRegister()); } private IEnumerator RequestAuthorizationAndRegister() { // Request Alert + Badge + Sound permissions and register for remote notifications var authOptions = AuthorizationOption.Alert | AuthorizationOption.Badge | AuthorizationOption.Sound; using (var req = new AuthorizationRequest(authOptions, true)) { Debug.Log("⏳ Waiting for user authorization..."); while (!req.IsFinished) { yield return null; } Debug.Log($"🔔 Authorization finished at {DateTime.Now}: granted={req.Granted}, error={req.Error}"); if (!req.Granted) { Debug.LogError("❌ User denied notification permissions! Cannot get APNs token."); yield break; } // Authorization granted → check for device token int attempt = 0; string token = req.DeviceToken; Debug.Log($"req.DeviceToken: {req.DeviceToken}"); while (string.IsNullOrEmpty(token) && attempt < MaxRetries) { attempt++; Debug.Log($"ℹ️ APNs token not available yet. Attempt {attempt}/{MaxRetries}. Waiting {RetryDelay} seconds..."); yield return new WaitForSeconds(RetryDelay); token = req.DeviceToken; } if (string.IsNullOrEmpty(token)) { Debug.LogWarning("⚠️ APNs token still null after multiple attempts. Try again on next app launch."); yield break; } Debug.Log($"📱 APNs Token acquired at {DateTime.Now}: {token}"); // Register with PlayFab var request = new RegisterForIOSPushNotificationRequest { DeviceToken = token, SendPushNotificationConfirmation = false }; PlayFabClientAPI.RegisterForIOSPushNotification(request, result => Debug.Log("✅ APNs token successfully registered with PlayFab."), error => Debug.LogError("❌ Failed to register APNs token with PlayFab: " + error.GenerateErrorReport())); } } } #endif When running on a real device (not simulator), the following is logged in Xcode: 🔔 Authorization finished: granted=True, error= ℹ️ APNs token not yet available. Try again on next app launch. In the Xcode console, I do not see the expected APNs registration message: [Device] Registered for remote notifications with token: <...> Environment Details: Engine: Unity 6000.2.6f2 Notifications package: com.unity.mobile.notifications 2.4.2 Xcode: 16.4 (16F6) iOS Device: iPhone 12, iOS 26.0.1 Testing Method: Building directly from Unity → Xcode → real device Signing mode: Automatic (with correct Team selected) Certificates in account: Apple Development certificate (active) Apple Distribution certificate (active) Provisioning Profile: Type: App Store (also tested Development profile) Enabled Capabilities: Push Notifications, In-App Purchase App ID Capabilities: Push Notifications: Enabled Development SSL certificate: Present Production SSL certificate: Not generated (yet) Background Modes -> remote notifications What I Have Verified: ✅ Push Notifications capability is enabled in the Xcode target (not UnityFramework). ✅ Team and Bundle Identifier match my Apple Developer App ID. ✅ App ID has Push Notifications enabled in the Developer Portal. ✅ Tested on a real iOS device with working internet. ✅ Rebuilt and reinstalled app after enabling Push Notifications. ✅ Authorization dialog appears and permission is granted by user. How can I resolve this issue?
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81
Jan ’26
Problem receiving Remote Notification in the background after Review Rejected
I created an app. One if its functionalities is receive Remote Notification in the background, while app is monitoring Significant Location Changes (SLC). This functionality worked fine. I was receiving these notifications correctly. Sometimes instantly, sometime with small or large delay. And then I send the app for review. It was rejected with 3 remarks: The app or metadata includes information about third-party platforms that may not be relevant for App Store users, who are focused on experiences offered by the app itself (I wrote that app communication works both for iOS and Android.) The app declares support for audio in the UIBackgroundModes key in your Info.plist but we are unable to locate any features that require persistent audio. EULA (End User License Agreement) is missing for in-app purchases. After the rejection the app is no longer receiving these notifications. They are there, since the app receives them, when I open app, or significant location change is detected. It also works, when I run the app directly from Xcode (in debug mode), not from TestFlight nor in Sandbox. It seem to me like Apple somehow spoiled my background capabilities on purpose or accidentally. Is it possible? What can I do with it? Is it the case that I should just fix the review remarks and send the app back to review, and once the app passes it, it will work again? Or should I not count on it? Any suggestions? I asked Apple using: https://developer.apple.com/contact/topic/#!/topic/select but so far no response.
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179
Aug ’25
Push Notifications Error
Hi, I'm experiencing an issue with my app. I use Firebase as my server, and it is great. Still, there is one issue: when I send push notifications from my app to users, the users will get the notification if the app is open, but not when it is closed. I have tried many solutions to fix it, even asking AI, but the issue is still there. I would be happy to give you access to Firebase and the Xcode workspace, as I have no clue how to fix it.
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100
Jan ’26
Push notification sent to uninstalled app
I am using push notification in my app. User token gets properly registered and is sent to server. Notification are also sent by server and recieved on device as expected. The problem occurs when user uninstalls the app. iOS does not provide any option to handle uninstall event. On top of that when server send notification to such device token APNS feedback service sends success message. Meaning APNS sends push notifications to uninstalled app.I have an API to unregister the device on server since no event is triggered I am unable to call it.Please suggest a way out.
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9.1k
Nov ’25
Questions for AlarmKit
We are so interested in AlarmKit which is presented at WWDC25. While we planning our app using AlarmKit, We had a few questions come to mind and were hoping you could provide some clarity. Please excuse the rather long list of questions, as we don't currently have a device available to test these features ourselves. System Actions Related Is there a limit to the number of alarms that can be scheduled using AlarmKit? Are alarms scheduled with AlarmKit persistent across device reboots? When an alarm is dismissed (either by swiping or pressing the power button), can our app detect this action and execute code in response? Can we control the behavior of the physical Lock Screen buttons when an AlarmKit alarm is active, for instance, to trigger a snooze action? Does AlarmKit function correctly during Do Not Disturb or Low Power Mode? What is the expected behavior when an alarm from our app (using AlarmKit) overlaps with an alarm from another app that also uses AlarmKit? Which one is going to get its priority? Thank you for your help. Sincerely
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247
Aug ’25
Push Notifications largely not get transmitted
I have three apps with a very low user rate, so it's easier to compare. In all three apps, when I send a notification to APNs, over two-thirds receive a "Stored - Device Offline" status, but only one or two notifications are delivered afterward. No message has been sent after that. The total number of recipients is 89; 26 were delivered to the device, and 62 were stored in APNs. One was delivered from storage, and one was discarded. All app users are located in the same region, and mobile internet or Wi-Fi is available everywhere. I can't believe that so many iPhone users aren't getting connected to APNs to receive the stored message. Or are event not connected. Or are there any other reasons why a notification cant be transmitted. (User beahaviour, time of not using the app or something else?)
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110
Mar ’25
What is the point of thread-id/grouping in push notifications if grouping depends upon user preferences?
There's plenty of articles out there about programatically grouping push notifications. However I have tried setting the thread-id in the push payload when sending a push, or setting the threadIdentifier for a received push in a notification service extension to be the same for several pushes. But if within the iPhone Settings / Notifications the user selects to display pushes as List and turns off Notification Grouping, then each notification resulting from the push appears on its own separately. Is there something other than thread-id/threadidentifier that is used to programmatically group them? If not then whats the point of these as grouping and display is actually under the control of user.
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102
Mar ’25
React Native iOS - Notification Service Extension Not Working
I've added a Notification Service Extension as a target to my React Native iOS app following Apple's official documentation. After completing all the setup steps as outlined in the documentation, the notification titles remain unchanged - notifications are arriving without any modifications, suggesting the extension isn't functioning properly.Testing Details: Sending notifications via Apple Push Notification Console Tested on iPhone 16 Pro Max (physical device) Tested on iPhone 15 Pro simulator Both show the same issue - no title modifications The extension appears to not be executing at all. Has anyone encountered similar issues with Notification Service Extensions in React Native projects, or can suggest troubleshooting steps to verify the extension is properly configured and running?
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107
Aug ’25
Error when validating the APNS Certificate
I trying to validate the certificate I created for APNS using the following command but I get an error. openssl s_client -connect gateway.push.apple.com:2195 -cert temp.pem -debug -showcerts Error: getaddrinfo: nodename nor servname provided, or not known connect:errno=0 Any help will be greatly appreciated.
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176
Sep ’25