Xcode 27 Beta 4: Enterprise Identity & Security Changes in iOS 18 and macOS 15

WHAT APPLE JUST SHIPPED: Xcode 27 Beta 4 and iOS 18/macOS 15 Developer Features

Apple released Xcode 27 beta 4 (27A5228h), enabling developers to build and test for iOS 18, iPadOS 18, macOS 15 Sequoia, watchOS 11, and tvOS 18. Key identity and security updates now available for testing and integration include:

• AuthenticationServices Updates: Enhanced Passkey APIs now support cross-platform credential retrieval and improved FIDO2 flows, including device-bound passkey management.
• Managed Apple ID Federation: New hooks for Entra ID, Okta, and Google Workspace federation, including streamlined SCIM provisioning and authentication logs in Apple Business Manager.
• MDM Protocol Extensions: Declarative Device Management expands to cover Passkey policies, App Tracking Transparency enforcement, and sign-in restrictions for Managed Apple IDs.
• LocalAuthentication Improvements: Face ID/Touch ID now expose expanded error codes and context-aware prompts in SwiftUI.

These features require devices running iOS 18 beta 4, macOS 15 Sequoia beta 4, and Xcode 27 beta 4 for building and testing. MDM and Apple Business Manager enhancements are visible in ABM/ASM portals after updating server profiles.

WHAT’S COMING: WWDC24 Announcements & Preview Features

• Sign in with Apple Expansion: OIDC claims now include device-bound passkey metadata and a new aud claim for granular audience validation. App developers can expect private email relay improvements—including expiration controls and relay status in user profiles.
• Verifiable Credentials in Wallet: iOS 18 adds ISO 18013-5 driver’s license support and generic credential provisioning for enterprise ID cards—accessible via new WalletKit APIs.
• MDM Enforcement of Passkey Usage: Admins can set policy to require platform passkeys for Managed Apple IDs, blocking fallback to passwords in federated environments.
• Kerberos SSO Extension for macOS Sequoia: Refined UI/UX for enterprise SSO, plus SSO extension configuration is now declarative and profile-driven.

WHY THIS IS BETTER: Concrete Improvements Over Previous Releases

• Passkey Management: Prior versions lacked device-bound credential enforcement—now, enterprises can require passkeys stored in Secure Enclave and managed via MDM.
• Federated Apple IDs: Improved SCIM flows and audit logs mean admins get real-time user provisioning/deprovisioning visibility and compliance, addressing gaps seen in Google Workspace and Okta integrations.
• Declarative Device Management: Expanding to cover identity and credential policies reduces custom scripts and manual profile pushes. Declarative updates are atomic and auditable, unlike legacy MDM payloads.
• Sign in with Apple OIDC Claims: Device-bound claims and audience controls mitigate replay attacks and align Apple with modern OIDC best practices, surpassing Android’s Google Identity services in granularity.

HOW TO IMPLEMENT OR RESPOND: Step-by-Step for Developers and IT Admins

For Developers: Enhanced Passkey APIs

To support cross-device passkey management in iOS 18/macOS 15, use new ASAuthorizationPlatformPublicKeyCredentialProvider APIs:

import AuthenticationServices

let credentialProvider = ASAuthorizationPlatformPublicKeyCredentialProvider(relyingPartyIdentifier: "example.com")

let registrationRequest = credentialProvider.createCredentialRegistrationRequest(options: [.requireDeviceBound])

let controller = ASAuthorizationController(authorizationRequests: [registrationRequest])
controller.delegate = self
controller.performRequests()

Device-bound options ensure passkeys are stored in Secure Enclave, not synced to iCloud Keychain.

For IT Admins: Declarative Device Management for Passkey Enforcement

To require platform passkeys for Managed Apple IDs, deploy the following mobileconfig payload via your MDM:

  
    PayloadContent
    
      
        PayloadType
        com.apple.passkey.management
        RequirePlatformPasskey
        
      
    
    PayloadDisplayName
    Passkey Enforcement Policy
    PayloadIdentifier
    com.example.passkey.enforce
    PayloadOrganization
    Enterprise IT
    PayloadVersion
    1
  

This restricts Managed Apple IDs to platform passkeys, blocking fallback to passwords or non-delegated credentials.

SCIM Provisioning & Federation Audit

Enable SCIM provisioning logs in Apple Business Manager:

1. Log into Apple Business Manager as an admin.
2. Navigate to Settings > Accounts > Federation.
3. Ensure SCIM provisioning is enabled and audit logs are visible for all user events.
4. Review logs for compliance and provisioning failures.

WHAT TO CHECK: Verification Steps

• On a test device running iOS 18/macOS 15, verify Passkey enforcement by attempting sign-in with a Managed Apple ID—password fallback should fail.
• In your app, ensure device-bound passkeys are generated via ASAuthorizationController and never uploaded to iCloud Keychain.
• In Apple Business Manager, confirm SCIM logs show real-time user creation and deletion events.
• For SSO Extension, check declarative profile deployment in MDM console—ensure policy is applied and Kerberos extension operates as configured.

BOTTOM LINE: Recommendation

Prioritise testing Passkey and Managed Apple ID policies in iOS 18 and macOS 15 now with Xcode 27 beta 4. Developers should integrate device-bound passkey APIs and audit OIDC changes. IT admins must enforce new passkey requirements and review federation logs for compliance. These upgrades directly strengthen authentication, reduce credential risk, and streamline identity management in the Apple enterprise ecosystem.