We are implementing a Platform SSO extension on macOS and are seeing repeated registration notifications from AppSSOAgent for the same unresolved registration state. We are trying to understand whether this is expected Platform SSO behavior, or whether our extension should be returning a different registration result for a cancelled user-registration flow. Scenario 1: Setup Assistant / preboot cancellation Device registration succeeds during setup. User registration starts. The user closes/cancels the registration web auth UI. Setup completes and the user reaches the desktop. Two “registration required” notifications are posted a few seconds apart, before the user clicks anything. In AppSSOAgent logs, we see two separate cycles like: resetRegistrationWithCompletion handleUserRegistrationForUser:repair:newPasswordUser:newSmartCardUser:notified:profile: Sending registration notification Adding notification request ... then again roughly 10–12 seconds later, before any user action. In some runs, even if the user clicks the first notification and registration is already in progress, another notification still appears. If the first registration attempt does not complete successfully, registration does not finish and the user must click the second notification and repeat the registration flow. After acting on the second notification, registration may then succeed. Scenario 2: login / repair window already open In another run after logout/login, while the registration window is already open, AppSSOAgent posts another registration notification. Additional detail: In some runs, our extension logs show the web auth flow failing with: breaking calling recursion for caller with bundleIdentifier: ... no extension WebAuthenticationSession error 1 But the duplicate-notification behavior is specifically interesting when AppSSOAgent posts a second notification before any new desktop click/retry. We also see AppSSOAgent logs such as: Removing 1 delivered notifications with identifiers (...) Removing 1 pending notification requests with identifiers (...) which suggests the same Platform SSO registration notification can exist in both delivered and pending state before being reposted. Questions After a user cancels Platform SSO user registration UI during Setup Assistant, what is the expected ASAuthorizationProviderExtensionRegistrationResult the extension should return? (.failed, .userInterfaceRequired, something else?) Is it expected for AppSSOAgent to run multiple resetRegistrationWithCompletion / handleUserRegistrationForUser... cycles for the same incomplete registration state and post duplicate registration notifications before any user action? Is there any documented meaning for the retry timing gaps (for example ~3 seconds in some runs, ~11 seconds in others)? If the registration UI is cancelled by the user, is there a recommended way for the extension to prevent AppSSOAgent from re-posting multiple notifications for the same unresolved registration state? We want to understand whether the duplicate notifications are expected Apple-side Platform SSO behavior for incomplete registration, or whether the extension is expected to signal cancellation differently.

I am using ASAuthorizationProviderExtensionLoginManager.resetKeys() to generate new user-specific keys, specifically userDeviceSigningKey and userDeviceEncryptionKey. Based on the documentation, my understanding was that resetKeys() only resets keys associated with a particular user account: https://developer.apple.com/documentation/authenticationservices/asauthorizationproviderextensionloginmanager/resetkeys/ However, during testing, I observed that calling resetKeys() also resets sharedDeviceSigningKey. I had assumed that shared device keys would only be reset via resetDeviceKeys().

I’m testing a macOS Platform SSO extension deployed through Jamf, and I’m seeing an issue where device registration completes successfully during Setup Assistant, but user registration never gets triggered. Current Platform SSO profile settings: Authentication mode:Secure Enclave Enable registration during setup:Enabled Create first user during Setup:Enabled New user creation authentication method:Password Observed behavior: The Platform SSO extension is discovered and loaded. Device registration starts and completes successfully. My extension’s device registration completion path is reached. registrationDidCompleteis called. The device configuration appears to be updated. After that, I expect Platform SSO to call the user registration flow, but my extension’sbeginUserRegistration(...)is never invoked. The strange part is that this only seems blocked at the user-registration handoff. Device registration during Setup Assistant works reliably.

We’re investigating a Platform SSO registration issue on macOS and wanted to check whether others have seen similar behavior or know whether this is expected system behavior. Scenario: Our extension implements ASAuthorizationProviderExtensionRegistrationHandler for device and user registration. On failure we complete with ASAuthorizationProviderExtensionRegistrationResult.failed, and on success we complete with .success. What we’re seeing: If registration fails multiple times, macOS shows multiple system dialogs saying: Registration failed and will automatically retry in a few minutes. If we do not close those earlier failure dialogs and then start another registration that succeeds, the old failure dialogs remain visible and do not dismiss automatically. They have to be closed manually one by one. From our side, these appear to be system-owned Platform SSO dialogs, not app-owned windows. We only return the registration result via the handler completion. Any guidance on whether macOS is expected to reconcile/dismiss earlier failure dialogs after a later success would also be helpful.

We are implementing Platform SSO with Secure Enclave–based authentication. In a standard (post-enrollment) flow, everything behaves as expected: Authentication uses urn:ietf:params:oauth:grant-type:jwt-bearer The Secure Enclave–backed credential is used correctly However, when using Automated Device Enrollment (ADE) with Simplified Setup, we observe different behavior: After device registration, Platform SSO triggers a login request to our IdP That request uses grant_type=password Instead of the expected urn:ietf:params:oauth:grant-type:jwt-bearer This occurs even though: The configuration specifies Secure Enclave as the authentication method The same configuration works as expected outside ADE Questions: Is this password grant during ADE / Simplified Setup an expected bootstrap flow? Is there any official documentation describing this? This behavior is currently undocumented, and clarification would help ensure correct IdP implementation.

Can a macOS Platform SSO extension reliably identify the original app behind a Safari or ASWebAuthenticationSession-mediated request, or does ASAuthorizationProviderExtensionAuthorizationRequest only expose the immediate caller such as Safari ? We are seeing: callerBundleIdentifier = com.apple.Safari callerTeamIdentifier = Apple audit-token-based validation also resolves to Safari So the question is whether this is the expected trust model, and if so, what Apple-recommended mechanism should be used to restrict SSO participation to approved apps when the flow is browser-mediated.

Hi, We are implementing Platform SSO and using attestKey during registration via ASAuthorizationProviderExtensionLoginManager. Could you clarify whether the attestKey flow involves sending attestation data to an Apple server for verification (similar to App Attest in the DeviceCheck framework), or if the attestation certificate chain is generated and signed entirely on-device without any Apple server interaction? The App Attest flow is clearly documented as using Apple’s attestation service, but the Platform SSO process is less clearly described. Thank you.

I’m implementing a macOS Platform SSO extension using ASAuthorizationProviderExtensionAuthorizationRequest. In beginAuthorization, I intercept an OAuth authorize request and call: request.complete(httpAuthorizationHeaders: [ "x-psso-attestation": signedJWT ]) I also tested: request.complete(httpAuthorizationHeaders: [ "Authorization": "Bearer test-value" ]) From extension logs, I can confirm the request is intercepted correctly and the header dictionary passed into complete(httpAuthorizationHeaders:) contains the expected values. However: the header is not visible in browser devtools the header does not appear at the server / reverse proxy So the question is: Does complete(httpAuthorizationHeaders:) support arbitrary custom headers, or only a restricted set of authorization-related headers ? Is there something that I might be missing ? And if custom headers are not supported, is there any supported way for a Platform SSO extension to attach a normal HTTP header to the continued outbound request ?

I need to launch ASWebAuthenticationSession from single sign on extension, but its not launching it might issue with anchoring window, I have create custom windo and passing it in presentanchor(for session) function, custom window is launching but ASWebAuthenticationSession browser is not launching Note - flow is like this Apple PSSO register window lauched OIDC login will happen via ASWebAuthenticationSession to get accesstoken which will use in device registration but ASWebAuthenticationSession is not launching, I am using custom scheme as redirect URI iskeywindow for custom window is always false what is right approach to achieve the goal

I have a question regarding Platform SSO and the use of Secure Enclave–backed keys with biometric policies. If we configure userSecureEnclaveKeyBiometricPolicy with userSecureEnclaveKey, my understanding is that the Secure Enclave key is protected by biometric authentication (e.g., Face ID / Touch ID). In this setup, during a login request that also refreshes the id_token and refresh_token, the assertion is signed using the userSecureEnclaveKey. My question is: Will this signing operation trigger a biometric prompt every time the assertion is generated (i.e., during login/token refresh) ?

While working with Platform SSO on macOS, I’m trying to better understand how the system handles cases where a user’s local account password becomes unsynchronized with their Identity Provider (IdP) password—for example, when the device is offline during a password change. My assumption is that macOS may store some form of persistent token during the Platform SSO user registration process (such as a certificate or similar credential), and that this token could allow the system to unlock the user’s login keychain even if the local password no longer matches the IdP password. I’m hoping to get clarification on the following: Does macOS actually use a persistent token to unlock the login keychain when the local account password is out of sync with the IdP password? If so, how is that mechanism designed to work? If such a capability exists, is it something developers can leverage to enable a true passwordless authentication experience at the login window and lock screen (i.e., avoiding the need for a local password fallback)? I’m trying to confirm what macOS officially supports so I can understand whether passwordless login is achievable using the persistent-token approach. Thanks in advance for any clarification.

While working with Platform SSO on macOS, I’m trying to better understand how the system handles cases where a user’s local account password becomes unsynchronized with their Identity Provider (IdP) password—for example, when the device is offline during a password change. My assumption is that macOS may store some form of persistent token during the Platform SSO user registration process (such as a certificate or similar credential), and that this token could allow the system to unlock the user’s login keychain even if the local password no longer matches the IdP password. I’m hoping to get clarification on the following: Does macOS actually use a persistent token to unlock the login keychain when the local account password is out of sync with the IdP password? If so, how is that mechanism designed to work? If such a capability exists, is it something developers can leverage to enable a true passwordless authentication experience at the login window and lock screen (i.e., avoiding the need for a local password fallback)? I’m trying to confirm what macOS officially supports so I can understand whether passwordless login is achievable using the persistent-token approach. Thanks in advance for any clarification.

Hi, We developed a Platform SSO extension for our IdP, Keycloak. It would be great to get some feedback on it: https://francisaugusto.com/2025/Platform_single_sign_on_diy/

Hi, I developed a Platform Single Sign-On extension and a corresponding extension for my IdP, which is Keycloak based. The code for both projects are here: https://github.com/unioslo/keycloak-psso-extension and https://github.com/unioslo/weblogin-mac-sso-extension I realized that, when using the Secure Enclave as the AuthenticationMethod, and according to Apple's documentation, the Extension doesn’t obtain fresh ID Tokens when they expire if the refresh token is still valid. When using password as the Authentication Method, it fetches new ID tokens when they expire, without prompting the user for credentials, by using the refresh token. My suggestion is that the same behavior should be implemented for Secure Enclave keys. The thing here is that usually, on OIDC flows, the ID/Access tokens are short-lived. It would make sense for the extension to provide fresh ID tokens. It doesn’t seem to make sense for me that, when using passwords, the extension would fetch these tokens, and not when having the Secure Enclave key. By not doing this, Apple almost forces the developer of an extension to fetch new ID tokens themselves, which doens’t make sense when it clearly provides fresh tokens when using passwords. It almost forces the developers to either implement that logic themselves, or to issue longer tokens, which is not so nice. How so you deal with this? Do you simply use the refresh token as an authentication token, or do you do some sort of manual refresh on the extension?

Hi everyone, We manage several macs through Microsoft Intune. We've deployed Platform SSO using the password based method (not the Secure Enclave) and have also enforced filevault encryption through policy. What we're trying to achieve is that multiple users can log into the same Mac. For example, I (the initial enrolling user) can log in without issues. However, we want a colleague to be able to log in as well if they're physically in front of the mac. The challenge we've run into is that once filevault is enabled (We're not sure about it but reading on forums it seems that the problem is filevault), it seems the network is not available at the login screen. This means that while the first user can create a mobile account and log in, a second user can't do the same. The moment we try to log in with another set of credentials, we get an immediate error and the password field shakes instantly, suggesting it's not even reaching out to the network or directory to validate the credentials. We'd like to confirm if this behavior is expected when FileVault is active and whether the only solution is to disable FileVault or if there are alternative solutions to allow network connectivity at the login screen. Essentially, we want to know if there's a way to let a second user log in without having to turn off disk encryption. Or if we can pre-authorize a set of users on the mac in order to create all the mobile account needed.. Thanks in advance! Thomas

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?

We are facing an issue with Platform SSO registration on macOS devices for AD-bound user accounts with Microsoft EntraID configuration. We are using the Platform SSO payload on macOS devices integrated with Entra ID, and it works as expected — registration completes successfully, and the password syncs with the Entra ID password. However, when we try the same on macOS devices with AD-bound (mobile) user accounts, the registration does not complete. To elaborate, the process successfully completes the initial WebView authentication but fails at the stage where Apple prompts for the password to sync the local macOS user’s password with the Entra ID password. It does not display any error, and even after entering a valid password, the process does not proceed further. However, when we try the same on a non-AD user account, it works fine. We have checked with Microsoft, and they confirmed that there are no restrictions on their side for AD-bound accounts. Since the issue appears to occur at the Apple system level, they advised us to reach Apple teams on this. Could you please check and let us know how we can proceed with this? Payload used: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>PayloadContent</key> <array> <dict> <key>AuthenticationMethod</key> <string>Password</string> <key>ExtensionIdentifier</key> <string>com.microsoft.CompanyPortalMac.ssoextension</string> <key>PayloadDisplayName</key> <string>Extensible Single Sign-On Payload</string> <key>PayloadIdentifier</key> <string>com.apple.extensiblesso.B408A658-3DAF-41FF-8A5D-AE77B380CB7B</string> <key>PayloadType</key> <string>com.apple.extensiblesso</string> <key>PayloadUUID</key> <string>D506CAFD-C802-41F2-9C3E-DF5289C315FF</string> <key>PayloadVersion</key> <integer>1</integer> <key>PlatformSSO</key> <dict> <key>AccountDisplayName</key> <string>EntraID</string> <key>AuthenticationMethod</key> <string>Password</string> <key>EnableCreateUserAtLogin</key> <true/> <key>LoginFrequency</key> <integer>3700</integer> <key>LoginPolicy</key> <array> <string>AttemptAuthentication</string> </array> <key>NewUserAuthorizationMode</key> <string>Admin</string> <key>UseSharedDeviceKeys</key> <true/> <key>UserAuthorizationMode</key> <string>Admin</string> </dict> <key>ScreenLockedBehavior</key> <string>DoNotHandle</string> <key>TeamIdentifier</key> <string>UBF8T346G9</string> <key>Type</key> <string>Redirect</string> <key>URLs</key> <array> <string>https://login.microsoftonline.com</string> <string>https://sts.windows.net</string> <string>https://login.partner.microsoftonline.cn</string> <string>https://login.chinacloudapi.cn</string> <string>https://login.microsoftonline.us</string> <string>https://login.microsoft.com</string> <string>https://login-us.microsoftonline.com</string> </array> </dict> </array> <key>PayloadDisplayName</key> <string>Platform SSO</string> <key>PayloadIdentifier</key> <string>42GBHOLAP04621.1BD5B6D9-640B-4DC3-9275-56DDD191A5FB</string> <key>PayloadType</key> <string>Configuration</string> <key>PayloadUUID</key> <string>58548FC6-38D9-4B28-9EDF-BEEAB03BAB23</string> <key>PayloadVersion</key> <integer>1</integer> </dict> </plist>

We have couple of devices that are registered into Platform SSO, and we have been noticing an issue when the user tried to login. After the users enters the password and hit the return key nothing happens, they need to hit the return key probably 10-15 times in order for the login to happen, the password entered is the correct one and it's just that hitting the return key doesn't invoke the login. On checking the log of the device one unusual thing that we noticed as compared to a different device where the login is working in a single go is that the AppSSOAgent or AppSSODaemon process were not getting invoked