Workforce vs. External Tenants in Microsoft Entra: What You Need to Know
Published 28 May 2025
Hey everyone,
Over the past few months, I’ve been asked a recurring question:
What’s the difference between a Workforce Tenant and an External Tenant in Microsoft Entra?
And how does that tie into B2B vs. B2C?
It’s a topic that’s become increasingly important, especially with recent changes in Microsoft’s identity strategy. This blog post will walk you through the key differences, clarify some common misconceptions, provide relevant use cases, and include a technical comparison of supported features.
What is a Workforce Tenant?
A Workforce Tenant refers to the standard Microsoft Entra ID tenant (formerly Azure AD), used to manage identities for employees, partners, contractors, and other organizational users. It supports a broad set of enterprise features, including:
- Single sign-on (SSO)
- Conditional Access
- Identity Governance
- Multi-Factor Authentication
- Device compliance
- Risk-based access policies
It also supports B2B collaboration — allowing you to invite and manage external identities securely within your own tenant, using their existing credentials from other Entra tenants or identity providers like Google.
This is the recommended and modern approach for secure collaboration across organizations.
What is an External Tenant?
Historically, Microsoft offered a separate identity platform called Azure AD B2C, optimized for consumer-facing applications. These tenants are commonly referred to as External Tenants, and they were designed to support:
- Customer identity and access management (CIAM)
- Social login (Google, Facebook, Apple)
- Email/password authentication
- Custom-branded login experiences
- Self-service sign-up and password reset
These tenants were entirely separate from a company’s Workforce Tenant and maintained their own isolated user directories and policies.
Why is there confusion?
The confusion stems from the fact that both models deal with external users, but the nature of those users is very different.
Type of UserIdentity ModelPlatform
Business partners
B2B collaboration
Workforce Tenant (Entra ID)
Contractors
B2B collaboration
Workforce Tenant (Entra ID)
App customers
B2C identity mgmt
External Tenant (Azure AD B2C)
With the rise of Entra External ID, Microsoft is now enabling support for customer identity scenarios within Workforce Tenants, effectively replacing the need for standalone Azure AD B2C tenants.
Use CasesWorkforce Tenant Use Cases (B2B):
Granting access to internal applications for partners or contractors
- Sharing SharePoint or Teams resources with guest users
- Enabling federated login via Google or SAML for workforce access
- Managing external identities under Conditional Access and MFA
External Tenant Use Cases (B2C):
- Allowing customers to sign up with Facebook or Apple ID to your mobile app
- Building a custom-branded login portal for a SaaS product
- Managing millions of customer identities independently from internal systems
Azure AD B2C Is Reaching End of Life
Microsoft is phasing out Azure AD B2C in favor of Entra External ID, which allows you to onboard both internal and external users directly into your Workforce Tenant using OpenID Connect, SAML, or federated identity providers.
Key advantages:
- Unified governance and security across all user types
- Native support for Conditional Access and Identity Protection
- Centralized audit and compliance
- No more managing two separate tenants or policy engines
Technical Comparison: Workforce Tenant vs. External TenantCapabilityWorkforce Tenant (B2B)External Tenant (Azure AD B2C)
Supported Identity Providers
Microsoft, Google, Facebook, SAML, OIDC
Microsoft, Google, Facebook, Apple, Email/Password
Identity Types
B2B guest users
Local accounts, social logins
Conditional Access
Fully supported
Partial (via Identity Experience Framework)
Multi-Factor Authentication
Entra MFA and Identity Protection
Limited support
Device Compliance
Supported via Intune + CA
Not supported
Lifecycle Management
Access reviews, entitlement mgmt
Not supported
Branding and Customization
Basic (logo, colors)
Full (custom HTML, JS, CSS)
User Journey Customization
Limited
Full via custom policies
Token Customization
Basic
Advanced customization
Federation (SAML, OIDC)
In public preview
Supported
Application Scale
Enterprise-grade
Internet-scale (millions of users)
Access Auditing and Logs
Unified with Microsoft 365
Separate diagnostic pipeline
Licensing
Entra ID P1/P2, MAU-based
B2C-specific MAU licensing
Reference: Microsoft Learn – Supported features for Entra External ID
https://learn.microsoft.com/en-us/entra/external-id/customers/concept-supported-features-customers
Summary
- Workforce Tenants are now the unified platform for managing both workforce and external identities.
- Azure AD B2C is effectively in maintenance mode — new investments are focused on Entra External ID.
- Use B2B for collaboration and External ID within your Entra tenant for customer identity scenarios.
- Aligning everything under one tenant simplifies governance, compliance, and operational overhead.
If you’re currently managing customer apps in Azure AD B2C, it’s time to start evaluating the migration path to Entra External ID.
We’re actively helping organizations make that transition — feel free to reach out if you’d like to discuss architecture, risks, or implementation strategy.