Future of Microsoft Entra External ID - Part 3

Future of Microsoft Entra External ID

Part 3: Roadmap, Best Practices, and Recommendations

As Microsoft continues to invest in External ID as the future of customer identity, this final part covers what's coming, how to implement External ID effectively, and strategic recommendations for your organization.

External ID Roadmap

Currently Available (GA)

Feature Description
Email + Password Standard consumer authentication
Email OTP Passwordless email verification
Social Identity Providers Google, Facebook, Apple, Microsoft Account
Native Authentication Full UI control for mobile apps
Custom Authentication Extensions Webhooks for custom logic
Company Branding Full UI customization
Custom URL Domains Your domain for sign-in pages
SAML/OIDC Federation Enterprise identity provider support
Device Authorization Flow OAuth 2.0 device code flow for input-constrained devices
Client Credentials (v2.0) Daemon and service-to-service authentication

In Preview

Feature Status Notes
JIT Password Migration Public Preview Via Custom Authentication Extension
Guest Invitations Preview Admin-role invitations only, not for CIAM user flows
Azure Monitor Integration Preview One-click log export and monitoring
Username / Alias Sign-in Public Preview Sign in with custom identifier (e.g. membership ID) in addition to email

Planned / Coming Soon

Based on B2C feature parity requirements and Microsoft announcements:

Feature Priority Notes
Authenticator App MFA High Currently email/SMS only
FIDO2 Passkeys High Modern passwordless
ID Protection High Risk-based authentication
Full Groups Support High App roles being phased in
ID Governance Medium Access reviews, entitlements
Enhanced SSPR Medium More authentication methods
Provisioning Logs Medium User lifecycle tracking

Migration Toolkit Roadmap

The B2C to External ID Migration Kit is evolving with planned features:

Currently Available

  • ✅ Bulk user export from B2C
  • ✅ Bulk user import to External ID
  • ✅ JIT password migration via Custom Authentication Extension
  • ✅ Attribute mapping and transformation
  • ✅ Local development mode (Azurite)
  • ✅ Application Insights telemetry

Planned Enhancements

Feature Description
Automated Infrastructure Bicep/Terraform templates for deployment
SFI Compliance Private Endpoints, VNet integration
Profile Synchronization Bidirectional sync during coexistence
Managed Identity Key Vault integration without secrets
Multi-Region Support Geo-distributed migration

Best Practices

1. Tenant Architecture

Diagram

Recommendations:

  • Separate tenants for production and dev/test
  • Use workforce tenant for admin operations
  • Implement proper RBAC across tenants

2. Application Registration

{
  "app_settings": {
    "authority": "https://yourtenant.ciamlogin.com/",
    "client_id": "your-app-id",
    "redirect_uris": [
      "https://yourapp.com/auth/callback",
      "https://jwt.ms"
    ]
  }
}

Best Practices:

  • Use .ciamlogin.com authority
  • Register separate apps for dev/test/prod
  • Implement proper token validation
  • Use PKCE for public clients

3. Custom Authentication Extensions

When using Custom Auth Extensions for claims enrichment or validation:

// Best practice: Use managed identity
var credential = new DefaultAzureCredential();

// Best practice: Cache external data
private static readonly MemoryCache _cache = new MemoryCache(new MemoryCacheOptions());

// Best practice: Implement retry logic
var retryPolicy = Policy
    .Handle<HttpRequestException>()
    .WaitAndRetryAsync(3, retryAttempt => 
        TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));

4. Security Considerations

Area Recommendation
Secrets Use Key Vault, never hardcode
Network Private endpoints for production
Logging Never log passwords or tokens
Certificates Use Key Vault-generated, auto-rotate
Conditional Access Require MFA for sensitive apps
Monitoring Enable Azure Monitor, set up alerts

5. Migration Strategy

Phased Approach:

Week 1-2: POC
├── Set up External ID tenant
├── Create test application
├── Test authentication flows
└── Validate JIT migration

Week 3-4: Pilot
├── Migrate 100-500 users
├── Monitor JIT function
├── Gather user feedback
└── Address issues

Week 5-8: Production Migration
├── Bulk migrate all users
├── Update application endpoints
├── Monitor closely
└── Support users

Week 9+: Cleanup
├── Verify all users migrated
├── Decommission B2C
└── Document lessons learned

When to Migrate

Migrate Now If:

  • Building new consumer applications
  • B2C custom policies are minimal
  • Need Native Authentication for mobile
  • Want unified Microsoft identity platform
  • Have simple sign-up/sign-in flows

Wait If:

  • Heavy investment in IEF custom policies
  • Require ID Protection (risk-based auth)
  • Need full ID Governance features
  • Complex MFA requirements (FIDO2, Authenticator)
  • Regulatory requirements need audit trail features not yet available

Timeline Recommendation

2025 Q1-Q2: Evaluate and POC
├── Test External ID features
├── Assess custom policy complexity
└── Plan migration approach

2025 Q3-Q4: Pilot and Production
├── Migrate new applications first
├── JIT migrate existing users
└── Monitor feature parity

2026+: Complete Migration
├── All new projects on External ID
├── Legacy B2C fully migrated
└── Decommission B2C

Cost Considerations

External ID Pricing

Tier MAU Limit Price
Free 50,000 $0
P1 Unlimited Per MAU
P2 Unlimited Per MAU

Key Differences from B2C:

  • Same MAU-based pricing model
  • No separate MFA add-on required
  • Premium features require P1/P2
  • All users count (not just guests)

Migration Costs

Component Cost
Azure Function ~$20-100/month (consumption)
Key Vault ~$5-20/month
Blob Storage ~$5-20/month
Development Time 2-8 weeks

Integration Patterns

Pattern 1: Direct Integration (Recommended)

Direct Integration pattern: Web App via MSAL to External ID ciamlogin endpoint

Use MSAL libraries with External ID authority:

const msalConfig = {
    auth: {
        clientId: "your-app-id",
        authority: "https://yourtenant.ciamlogin.com/",
        redirectUri: "https://yourapp.com/auth/callback"
    }
};

Pattern 2: Native Authentication (Mobile)

Native Authentication pattern: Mobile App with Native UI to External ID Native Auth

Full control over UI with SDK calls to External ID APIs.

Pattern 3: Claims Enrichment

Claims Enrichment pattern: User to External ID to Custom Extension webhook to External Data

Use TokenIssuanceStart event to add claims from external systems.

Monitoring and Operations

Key Metrics to Track

// Sign-in success rate
SigninLogs
| where TimeGenerated > ago(24h)
| where AppDisplayName == "Your Consumer App"
| summarize 
    Total = count(),
    Success = countif(ResultType == 0),
    Failure = countif(ResultType != 0)
| extend SuccessRate = round(100.0 * Success / Total, 2)

// JIT migration progress
// (Custom metric from your Function)
customMetrics
| where name == "JitMigrationSuccess"
| summarize MigratedToday = sum(value) by bin(timestamp, 1d)

// Authentication methods used
SigninLogs
| where TimeGenerated > ago(7d)
| summarize count() by AuthenticationMethodsUsed

Alerts to Configure

Alert Condition Priority
Sign-in failures spike >10% increase in failures High
JIT function errors Any 5xx response Critical
Latency increase P95 > 3 seconds Medium
New user surge >200% normal sign-ups Low

Summary and Recommendations

Key Takeaways

  1. External ID is the future - B2C is end-of-sale for new customers
  2. Migration tools exist - Microsoft's kit handles bulk and JIT migration
  3. Feature parity improving - Gap closing with each release
  4. Start planning now - Early adoption reduces risk

Action Items

Priority Action
Immediate Evaluate External ID for new projects
Short-term POC migration toolkit in dev environment
Medium-term Pilot migration with subset of users
Long-term Full production migration and B2C decommission

Final Thoughts

Microsoft Entra External ID represents a significant evolution in consumer identity management. While some B2C features are still being ported, the platform is mature enough for most consumer scenarios. Organizations should:

  • Start new projects on External ID
  • Plan migrations for existing B2C applications
  • Monitor Microsoft's roadmap for feature updates
  • Invest in Custom Authentication Extensions for flexibility

The migration toolkit, especially JIT password migration, makes the transition smooth for end users while providing a structured approach for IT teams.

Resources

Documentation

Tools

Community

← Part 2 - Migration Tools | ← Part 1 - Introduction

This concludes the Microsoft Entra External ID series. For questions or assistance with your migration, contact your Microsoft representative or visit the resources above.

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