Hello, I’m experiencing an issue with email deliverability when sending messages through Apple’s private email relay service. Our app uses “Sign in with Apple” and sends communication emails to users through relay addresses . Messages are successfully delivered but are consistently being placed in users’ spam or junk folders. Configuration summary: Domain: myapp.example Mail server: OVH SMTP SPF and DKIM: Active and validated Domain and sender registered under “Sign in with Apple for Email Communication” Messages pass SPF and DKIM checks successfully, but emails relayed by Apple’s private service are still being marked as spam. Could anyone confirm if there are additional steps or configurations required to improve deliverability (e.g., DMARC alignment or specific header requirements)? Thank you for your help!

Private relay emails are not being delivered, even though we've followed the guidance here, https://developer.apple.com/help/account/capabilities/configure-private-email-relay-service/ iCloud, gmail etc. get delivered fine but as soon as its a private relay email address they get bounced as unauthorized sender. We've tried a couple of domains but here I'll document test.x.domain.com We have registered domains (test.x.domain.com), also the sender communication emails just to be safe (noreply at test.x.domain.com). Passed SPF Authentication, DKIM Authentication. ESP account shows as all green checks in mailgun. Is there any way to track down what the actual rejection reason is? { "@timestamp": "2025-08-20T14:30:59.801Z", "account": { "id": "6425b45fb2fd1e28f4e0110a" }, "delivery-status": { "attempt-no": 1, "bounce-type": "soft", "certificate-verified": true, "code": 550, "enhanced-code": "5.1.1", "first-delivery-attempt-seconds": 0.014, "message": "5.1.1 <bounce+b53c9e.27949-6qj4xaisn4k=privaterelay.appleid.com@test.x.domain.com>: unauthorized sender", "mx-host": "smtp3.privaterelay.appleid.com", "session-seconds": 1.7229999999999999, "tls": true }, "domain": { "name": "test.x.domain.com" }, "envelope": { "sender": "noreply@test.x.domain.com", "sending-ip": "111.22.101.215", "targets": "6qj4xaisn4k@privaterelay.appleid.com", "transport": "smtp" }, "event": "failed", "flags": { "is-authenticated": true, "is-delayed-bounce": false, "is-routed": false, "is-system-test": false, "is-test-mode": false }, "id": "1gtVBeZYQ0yO1SzipVP99Q", "log-level": "error", "message": { "headers": { "from": "\"Test Mail\" <noreply@test.x.domain.com>", "message-id": "20250820143058.7cac292cf03993f2@test.x.domain.com", "subject": "Test Mail", "to": "6qj4xaisn4k@privaterelay.appleid.com" }, "size": 22854 }, "primary-dkim": "s1._domainkey.test.x.domain.com", "reason": "generic", "recipient": "6qj4xaisn4k@privaterelay.appleid.com", "recipient-domain": "privaterelay.appleid.com", "recipient-provider": "Apple", "severity": "permanent", "storage": { "env": "production", "key": "BAABAgFDX5nmZ7fqxxxxxxZNzEVxPmZ8_YQ", "region": "europe-west1", "url": [ "https://storage-europe-west1.api.mailgun.net/v3/domains/test.x.domain.com/messages/BAABAgFDXxxxxxxxxxxxxxNzEVxPmZ8_YQ" ] }, "user-variables": {} }

Dear Sir or Madam, Thank you for your continued support. My name is Sato from atmos. We are currently working with a vendor to implement Apple Sign In as a login method for our app, but we are encountering some issues and would like to contact you about them. The Apple Sign In functionality itself is almost complete, but during verification, email relay is not permitted by Apple when Apple Sign In is used with a non-public email address, making it impossible to complete email relay verification for users. We have reviewed the settings in “/account/resources/services/configure,” checked your FAQ, and explored all other possible solutions within our scope, but the situation remains unchanged. Would it be possible for your team to confirm the cause of the email relay not being permitted? Thank you for your assistance. atmos Sato Translated with DeepL.com (free version)

Hello. Some of my users are signing in using "Sign in with Apple" and choosing the "Hide My Email" option. As expected, Apple generates a private relay email address. However, emails that we send to these addresses are not being delivered — the users report that they are not receiving anything. We’ve configured our email sending domains in the Apple Developer portal, and all domains have been successfully verified with SPF records marked as OK. Our system is sending the emails as usual, and we're not receiving any bounce-back or error messages. Everything looks fine on our end. Is there something specific we need to configure to ensure emails sent to privaterelay.appleid.com addresses are delivered correctly? Are there any known limitations or additional requirements for using Apple's private relay service? Thank you!

Our organization operates a web platform that hosts numerous newspaper properties. We recently acquired a new newspaper and are in the process of integrating it into our platform. As part of this transition, we’ve successfully transferred the App and App ID for the acquired newspaper into our Apple Developer portal. However, no Service ID associated with Sign in with Apple was included in the transfer. Our current implementation uses a single, unified Service ID for all existing newspaper properties. This Service ID facilitates OAuth via a centralized Identity Server. The organization we acquired provided a CSV file containing a list of transport_ids, and based on our understanding, we’re expected to use the Apple endpoint: https://appleid.apple.com/auth/usermigrationinfo to initiate a registration process by submitting our Service ID (client_id) along with each transport ID. This step is required before users can sign in, and it should return the existing relay email address. We have a few key concerns: Service ID Compatibility It appears that users cannot be transferred between Service IDs. In our case, there are now two: a.) Our existing Service ID (used across all current newspaper properties) b.) A separate Service ID previously associated with the acquired newspaper 3.) Due to architectural constraints, our platform cannot dynamically toggle between multiple Apple Service IDs. All properties authenticate through our unified Identity Server bound to our existing Service ID. 4.) Is it possible to call /usermigrationinfo using our existing Service ID rather than the one originally used by the acquired property? 5.) Relay Email and Apple ID Consistency 6.) We’re seeing conflicting information about whether the Apple relay email address (@privaterelay.appleid.com) and the Apple user ID are preserved during this migration. Some sources suggest that the relay email and Apple ID are tightly coupled to both the Service ID and Team ID. 7.) If we call /usermigrationinfo with our existing Service ID, will the same relay email be returned, or will Apple issue a new one?

Our app (app1) was recently transferred from Team A to Team B. While reviewing the Apple login implementation, we discovered that "Sign in with Apple" had been incorrectly set up to use the Service ID and App ID of another app (app2) — specifically, it was using app2.service as the Service ID and app2 as the App ID. In other words, app1’s users were authenticated through app2’s credentials due to a misconfiguration on our part. Now that app1 has been transferred to Team B, we’re trying to preserve those users. However, app2 is still in Team A, and we cannot maintain Team A anymore — meaning app2 must also be transferred to Team B if we want to retain access to the user data. One idea we considered is submitting app2 for App Review (even though it's non-functional) just to fulfill the transfer requirements, and then transferring it to Team B solely to retain the Apple login setup. Is this approach acceptable? Are there any recommended ways to handle this kind of misconfiguration while preserving existing Sign in with Apple users?

My existing iOS app has a legacy App ID prefix which does not match my Team ID. I am planning on migrating it to my Team ID. I am aware of the potential issues with keychain access groups, however I wanted to double check that there are no issues related to "Sign in with Apple". My app is currently the "Primary App ID" in the "Sign in with Apple" settings. The full App ID is listed there, including the prefix. Can someone from the relevant team at Apple confirm that changing the App ID prefix to Team ID has no effect related to "Sign in with Apple"?

Recently, we have adapted the passkey function on the Mac, but we always encounter the error message "Unable to verify the web credentials association of xxx with domain aaa. Please try again in a few seconds." We can confirm that https://aaa/.well-known/apple-app-site-association has been configured and is accessible over the public network. Additionally, the entitlements in the app have also been set with webcredentials:aaa. This feature has been experiencing inconsistent performance. When I restart my computer or reinstall the pkg, this feature may work or it may still not work. I believe this is a system issue. Here is feed back ID: FB20876945 In the feedback, I provided the relevant logs. If you have any suggestions or assistance, please contact me. I would be extremely grateful!

Hello, When using ASWebAuthenticationSession with an HTTPS callback URL (Universal Link), I receive the following error: Authorization error: The operation couldn't be completed. Application with identifier jp.xxxx.yyyy.dev is not associated with domain xxxx-example.go.link. Using HTTPS callbacks requires Associated Domains using the webcredentials service type for xxxx-example.go.link. I checked Apple’s official documentation but couldn’t find any clear statement that webcredentials is required when using HTTPS callbacks in ASWebAuthenticationSession. What I’d like to confirm: Is webcredentials officially required when using HTTPS as a callback URL with ASWebAuthenticationSession? If so, is there any official documentation or technical note that states this requirement? Environment iOS 18.6.2 Xcode 16.4 Any clarification or official references would be greatly appreciated. Thank you.

Hi, I'm trying to implement web-browser SignIn with Apple with my new app. I'm trying to "Associate your website to your app" like described in this doc: https://developer.apple.com/help/account/capabilities/configure-sign-in-with-apple-for-the-web So I created a Service ID for this specific login. I want this login page to display my app icon and name when presented to users. My issue: When I associate my new app the the service, the link is somehow not working. The login page show the "service" login (with a generic apple logo and the Service ID's name) instead of the actual App name. I'v been able to link my new service to older apps succesfully !!! (the login page correctly shows the old apps icons and names) Why is my new app not associated with the service ? I am missing something here ? is there an additionnal step that I need to take in order to link the service to my newest app ? Thanks !

Hello everyone! We are from Russia, and we no longer have an official Apple store. All phones are imported through parallel imports. Yesterday, my wife logged out of her Apple ID and logged in to someone else's account, and as a result, her phone was in lost and locked mode. We have a sales receipt confirming the purchase, but it is from a Russian store. Can you please tell me if there is a way to unlock the phone or if it is already a brick? Scammers are asking for money to unlock the phone. Thank you in advance for your reply!

I'm looking to implement USB monitoring for FIDO2 authentication through a custom Authorization Plugin, specifically for the below ones. This plugin applies to the following macOS authorization mechanisms: system.login.console — login window authentication system.login.screensaver — screensaver unlock authentication The goal is to build a GUI AuthPlugin, an authorization plugin that presents a custom window prompting the user to "Insert your FIDO key”. Additionally, the plugin should detect when the FIDO2 device is removed and respond accordingly. Additional Info: We have already developed a custom authorization plugin which is a primary authentication using OTP at login and Lock Screen. We are now extending to include FIDO2 support as a primary. Our custom authorization plugin is designed to replace the default loginwindow:login mechanism with a custom implementation. Question: Is there a reliable approach to achieve the USB monitoring functionality through a custom authorization plugin? Any guidance or pointers on this would be greatly appreciated.

Why can’t sandboxed mac app store apps have full disk access available in the system settings for full disk access? I discovered mac app store apps in release mode cannot access the ai auggie command line program and other command line programs like opengrep on your system. Debug builds fine. I came up with a workaround: Since I have an ssh client built in for connecting to remote servers, why not connect to ssh on the same local machine… Ask the user for their username and password in a popup. To do this, you have to enable remote login on your mac in system settings -> sharing. In addition you must grant full disk access to cli ssh in system settings: add /usr/libexec/sshd-keygen-wrapper It all works, but I don’t see the cli program in mac settings. To remove the cli program you must run a command line program to remove all full disk access support from all apps. No way to just undo ssh. So my question is, even though I got CodeFrog all working for a mac app store release, should I not do it because it’s insecure or too complicated with the system settings? Should I instead sell the app off the store like Panic Nova? Need some advice. I have not implemented in app purchases yet. Should I just have a reality check and sell the app off the store, or try for app store approval? Bummer… Maybe I’m ahead of my time, but perhaps Apple could review the source code for apps requesting full disk access and make sure there’s nothing fraudulent in them. Then, developer tools app store apps could be in the store with the user’s assurance that nothing is happening behind the scenes that is scary. From: https://blog.greenrobot.com/2025/11/10/i-have-a-decision-to-make/ Related post: https://developer.apple.com/forums/thread/806187 I submitted a code level tech support question for this. They directed me here.

Hi, we are having Sign in with Apple issues. For a large % of new users on our app which select this option, the first name and last name values are not being passed to us. This is the case in both scenarios - where the user shares their email address or hides it, and happens on iPhone when the user selects the default iCloud account. We're unclear why this is occurring.

I cannot find any reference to this within the Apple developer documents (or certainly searching for multiple possible keywords yields no results). The only reference I can find is to documents written in support of its announcement in 2002: https://developer.apple.com/news/?id=huqjyh7k. Is there any further documentation on implementing or has the capability been deprecated?

Is there any particular reason why ASWebAuthenticationSession doesn't have support for async/await? (example below) do { let callbackURL = try await webAuthSession.start() } catch { // handle error } I'm curious if this style of integration doesn't exist for architectural reasons? Or is the legacy completion handler style preserved in order to prevent existing integrations from breaking?

I am developing a daemon-based product that needs a cryptographic, non-spoofable proof of machine identity so a remote management server can grant permissions based on the physical machine. I was thinking to create a signing key in the Secure Enclave and use a certificate signed by that key as the machine identity. The problem is that the Secure Enclave key I can create is only accessible from user context, while my product runs as a system daemon and must not rely on user processes or launchAgents. Could you please advise on the recommended Apple-supported approaches for this use case ? Specifically, Is there a supported way for a system daemon to generate and use an unremovable Secure Enclave key during phases like the pre-logon, that doesn't have non user context (only the my application which created this key/certificate will have permission to use/delete it) If Secure Enclave access from a daemon is not supported, what Apple-recommended alternatives exist for providing a hardware-backed machine identity for system daemons? I'd rather avoid using system keychain, as its contents may be removed or used by root privileged users. The ideal solution would be that each Apple product, would come out with a non removable signing certificate, that represent the machine itself (lets say that the cetificate name use to represent the machine ID), and can be validated by verify that the root signer is "Apple Root CA"

Recently I am trying to implement apple oauth in expo web version, I created the service id and other related info, i have issue @PostMapping("/callback") public ResponseEntity handleAppleCallback(@RequestParam Map<String, String> body) { String code = body.get("code"); String idToken = body.get("id_token"); if (code == null) { return ResponseEntity.badRequest().build(); } // Redirect to your Expo Web app with the code in query String frontendUrl = "https://mobile-dot-dev-epicportal.uc.r.appspot.com/apple-callback?code=" + code; return ResponseEntity.status(HttpStatus.FOUND) .header("Location", frontendUrl) .build(); } when i pass the code recived from apple to this route i am getting invalid_grant i am not sure what is wrong here

General: Forums topic: Privacy & Security Apple Platform Security support document Developer > Security Enabling enhanced security for your app documentation article Creating enhanced security helper extensions documentation article Security Audit Thoughts forums post Cryptography: Forums tags: Security, Apple CryptoKit Security framework documentation Apple CryptoKit framework documentation Common Crypto man pages — For the full list of pages, run: % man -k 3cc For more information about man pages, see Reading UNIX Manual Pages. On Cryptographic Key Formats forums post SecItem attributes for keys forums post CryptoCompatibility sample code Keychain: Forums tags: Security Security > Keychain Items documentation TN3137 On Mac keychain APIs and implementations SecItem Fundamentals forums post SecItem Pitfalls and Best Practices forums post Investigating hard-to-reproduce keychain problems forums post App ID Prefix Change and Keychain Access forums post Smart cards and other secure tokens: Forums tag: CryptoTokenKit CryptoTokenKit framework documentation Mac-specific resources: Forums tags: Security Foundation, Security Interface Security Foundation framework documentation Security Interface framework documentation BSD Privilege Escalation on macOS Related: Networking Resources — This covers high-level network security, including HTTPS and TLS. Network Extension Resources — This covers low-level network security, including VPN and content filters. Code Signing Resources Notarisation Resources Trusted Execution Resources — This includes Gatekeeper. App Sandbox Resources Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com"

Hi, I am developing a Platform SSO in order to have integrated with our IdP, which I am also adapting to provide the right endpoints for Platform SSO. I have a few questions about the implementation: does the client-request-id need to be present on all requests? Is it unique per request, or requests that are bound together like those requesting a nonce and those who will use that nonce should use the same client-request-id? I am not sure how the loginManager.presentRegistrationViewController works. I'd like to get the user to authenticate to my IdP before device registration. So I am not sure if I should provide my own Webview or something similar or if this method should do something for me; My idea is to request user authentication once, save the state when performing device registration, so that I avoid asking for user authentication twice when performing user registration. Is this the right way to do it? How does platform SSO handles tokens? If one application of my IdP requests the authentication on a common OIDC/OAuth2 flow, should I perform some sort of token exchange? How about SAML? Platform SSO seems to be token-centric, but how does one handle SAML flows? Is it by using WebView as well?