Microsoft is fundamentally changing how external users access SharePoint Online, Microsoft Teams, and Office365 services. This is not a UI update. It is a shift in identity governance, external collaboration settings, and how organizations manage user access across the Microsoft ecosystem.
The transition from legacy SharePoint One-Time Passcode (OTP) to Microsoft Entra B2B external sharing will directly impact how external partners, vendors, and external organizations access your workforce tenant.
If your organization uses SharePoint external sharing, this affects you.
What Is Changing in Microsoft Entra B2B External Sharing
Microsoft is moving all external access toward Entra B2B and Microsoft Entra ID-based identity management.
This means:
Every external users becomes a guest user access object in Azure AD / Microsoft Entra ID
Authentication is handled via Microsoft Entra account
No more anonymous OTP-based access for SharePoint links
All access is governed by Conditional Access policies
Core shift
This applies across: SharePoint Online, Microsoft Teams, Microsoft 365 Groups, and the Azure AD / Microsoft Entra admin center.
Link-based sharing (SharePoint OTP)
Identity-based sharing (Entra B2B)
How External Access Works Now vs Future Model
Internet Explorer era systems still partially reflected this behavior
External users click a link
Receive an email address verification code
Temporary sign in
No persistent identity in directory
External users are invited using add guests
Guest created inside Microsoft Entra ID
Access controlled via tenant level policies
Full identity governance lifecycle applied
Still relying on SharePoint OTP links for external partners? We can tell you exactly how exposed your tenant is before the cutover hits.
Check If Your Tenant Is Already at Risk →Microsoft Entra B2B External Sharing Architecture
The new architecture uses:
Microsoft Entra External ID
Azure Active Directory (Azure AD)
B2B direct connect
External Identities
Microsoft Entra admin center
Azure portal
Each external user is now a real identity object inside your system.
This enables:
full audit logs
user type classification (internal users vs external users)
device claims
MFA enforcement
sign-in experience tracking
Security Updates Driving This Change
Microsoft is enforcing modern security updates aligned with Zero Trust:
multifactor authentication required for external users
Conditional Access policies applied to guests
identity governance enforcement
risk-based user access control
enforced sharing settings
This ensures that external collaboration is no longer uncontrolled.
SharePoint External Sharing Changes Explained
Managed through:
SharePoint admin center
site level
site collection
organization-level settings
Key changes:
External users must exist in Entra ID
No more anonymous document sharing
All document libraries inherit identity policies
External access is tied to Microsoft 365 Groups
Sensitivity Labels can restrict external sharing behavior
Conditional Access and Identity Governance
Once external users are in Entra B2B:
You can enforce:
Conditional Access policies
MFA for external partners
geographic restrictions (e.g., San Francisco office policies or regional access rules)
device compliance checks
session controls
This is part of identity governance inside Microsoft Entra ID.
External Collaboration Settings and Sharing Controls
Administrators manage:
external collaboration settings
tenant-level sharing restrictions
domain allow/block lists
guest invitation controls
These settings define:
who can add guests
how external partners join
how external organization access is structured
Not sure who can add guests, or how your domain allow/block lists are configured? We’ll map your actual external sharing exposure.
Understand Your External Sharing Exposure →Sign-In Experience and Redemption Process
The new system changes how users:
sign in
complete redemption process
access SharePoint or Teams
Instead of OTP emails, users:
use Microsoft account or work identity
complete Entra B2B authentication
enter via secure single sign flow
This improves user experience and security consistency across Microsoft Azure clouds.
Real Systems Impact (What Breaks if You Don’t Migrate)
Legacy SharePoint external links may fail.
Impacts include:
external partners losing access
broken SharePoint site links
inaccessible external collaboration settings
vendor disruption in Teams channels
failure of legacy external access links
Users may see:
Guest User Lifecycle and Identity Management
With Entra B2B:
guest users are fully tracked in Azure Active Directory
lifecycle is managed (create → active → review → remove)
access reviews ensure clean identity hygiene
This is a major great benefit for compliance and audit readiness.
If your organization still relies on SharePoint OTP links for any external partner, vendor, or client, that access breaks under Entra B2B.
There’s no grace period for unmigrated links once Microsoft enforces the cutover — and no notification beyond “Access denied.”
External Identities and Hybrid Scenarios
Microsoft supports:
implement hybrid solutions
federated identity systems
social identities (where applicable)
cross-tenant collaboration via B2B direct connect
This allows secure collaboration between:
internal users
external partners
external organization tenants
Microsoft Entra Admin Center and Azure Portal Management
Admins now manage everything in: Microsoft Entra admin center and the Azure portal.
Key controls:
guest invitations
access policies
identity governance rules
external collaboration configuration
Between Entra admin center and the Azure portal, guest invitations and access policies get scattered fast. We’ll help you consolidate before enforcement lands.
Avoid External Access Failures in 2026 →Technical Support, Documentation, and Learning
Microsoft provides:
trusted Microsoft documentation
External Identities - Training
Ask Learn
Learn More
Additional resources
AI-driven AI assistant
modern chat experience
These tools help admins manage migration and governance changes.
Migration Considerations (Real-World)
Organizations must evaluate:
existing SharePoint external links
legacy guest accounts in Azure AD
identity sprawl across Office365
current sharing settings in SharePoint admin center
compliance policies
Browser and Access Compatibility Notes
Users may still encounter:
Internet Explorer limitations (legacy systems)
need to Download Microsoft Edge for full compatibility
Modern Entra B2B flows are optimized for modern browsers only.
Best Practices for External Access Management
To prepare:
enforce tenant-level governance policies
clean up external users regularly
apply sensitivity labels to document libraries
restrict unmanaged external sharing
monitor external organization access
use Microsoft Entra External ID lifecycle tools
Next Steps for Organizations
Enable Entra B2B integration
Audit current external users
Migrate SharePoint external sharing settings
Implement Conditional Access policies
Review identity governance model
Prepare external collaboration controls
Train admins using Microsoft resources
Final Takeaway
Microsoft is no longer treating external sharing as a simple link-sharing feature.
It is now:
A fully governed identity system inside Microsoft Entra ID.
Organizations that adapt will gain:
stronger security
better compliance
controlled external collaboration
improved identity governance
Those that don’t will face:
broken access
governance gaps
unmanaged external users
compliance risk
Prepare your Microsoft 365 environment for Entra B2B
Whether you want to self-check first or get a tailored plan, here’s where to go next.
Secure Guest Access Governance Guide
A free guide on automating guest onboarding, approvals, and access reviews in Microsoft Teams and SharePoint — the same governance model Entra B2B now requires.
Get the GuideShort form · instant download
Book a Migration Assessment
A free guide on automating guest onboarding, approvals, and access reviews in Microsoft Teams and SharePoint — the same governance model Entra B2B now requires.
Book a Call30 min · no obligation
