Microsoft Entra ID has evolved rapidly over the last few years, with Microsoft continuously introducing new identity, access, and security capabilities as part of the broader Zero Trust strategy. While many organizations hold the necessary Entra ID and Microsoft 365 licenses (often through E3 or E5 bundles), a number of these advanced features remain under‑utilised or entirely unused. This is frequently due to limited awareness, overlapping capabilities or uncertainty about where and how these features provide real architectural value.

One such capability which is not frequently used is Authentication Context.  Although this feature is available for quite some time, it is often misunderstood or overlooked because it does not behave like traditional Conditional Access controls. Consider Authentication Context as a mobile “assurance tag” that connects a resource (or a particular access route to that resource) to one or several Conditional Access (CA) policies, allowing security measures to be enforced with resource-specific accuracy instead of broad, application-wide controls. Put simply, it permits step-up authentication only when users access sensitive information or perform critical actions, while maintaining a smooth experience for the “regular path.”

When used intentionally, it enables resource‑level and scenario‑driven access control, allowing organizations to apply stronger authentication only where it is actually needed without increasing friction across the entire user experience.

Not expensive 

Most importantly to use Authentication Context the minimum licensing requirement is Microsoft Entra ID Premium P1 which most customers already have this license.  so you not need to convenience for higher license to utilize this feature. But do note Entra Premium 2 is needed if your Conditional Access policy uses advanced signals, such as:

• User or sign‑in risk (Identity Protection)
• Privileged Identity Management (PIM) protected roles
• Risk‑based Conditional Access policies

The Workflow 

Architecturally, Authentication Context works when a claims request is made as part of token issuance commonly expressed via the acrs claim. When the request includes a specific context (for example c1), Entra evaluates CA policies that target that context and forces the required controls (MFA, device compliance, trusted location, etc.). The important constraint: the context must be requested/triggered by a supported workload (e.g., SharePoint) or by an application designed to request the claim; it is not an automatic “detect any action inside any app” feature.

Lets look at few high level architecture reference

1. Define “assurance tiers” as contexts

Create a small set of contexts (e.g., c1: Confidential Access, c2: Privileged Operations) and publish them for use by supported apps/services.

2. Bind contexts to resources

Assign the context to the resource boundary you want to protect—most commonly SharePoint sites (directly or via sensitivity labels), so only those sites trigger the context.  (e.g - Specific SharePoint sites like financials, agreements etc )

3. Attach Conditional Access policies to the context

Create CA policies that target the context and define enforcement requirements (Additional MFA strength, mandating device compliance, or location constraint through named locations etc.). The context is the “switch” that activates those policies at the right moment.

4. Validate runtime behavior and app compatibility

Because authentication context can impact some client apps and flows, validate supported clients and known limitations (especially for SharePoint/OneDrive/Teams integrations).

Some Practical Business Scenarios 

Scenario A — Confidential SharePoint Sites (M&A / Legal / HR)

Problem: You want stronger controls for a subset of SharePoint sites without forcing those controls for all SharePoint access.

Architect pattern: Tag the confidential site(s) with Authentication Context and apply a CA policy requiring stronger auth (e.g., compliant device + MFA) for that context.

Pre-reqs: SharePoint Online support for authentication context; appropriate licensing and admin permissions; CA policies targeted to the context

Scenario B — “Step-up” Inside a Custom Line-of-Business App

Problem: Users can access the app normally, but certain operations (approval, export, privileged view) need elevated assurance.

Architect pattern: Build the app on OpenID Connect/OAuth2 and explicitly request the authentication context (via acrs) when the user reaches the sensitive path; CA then enforces step-up.

Pre-reqs: App integrated with Microsoft identity platform using OIDC/OAuth2; the app can trigger claims requests/handle claim challenges where applicable; CA policies defined for the context

Scenario C — Granular “Resource-based” Zero Trust Without Blanket MFA

Problem: Security wants strong controls on crown jewels, but business wants minimal prompts for routine work.

Architect pattern: Use authentication context to enforce higher assurance only for protected resources (e.g., sensitive SharePoint sites). This provides least privilege at the resource boundary while reducing global friction.

Pre-reqs: Clearly defined resource classification; authentication context configured and published; CA policies and monitoring.

In a nutshell,  Authentication Context allows organizations to move beyond broad, one‑size‑fits‑all Conditional Access policies and adopt a more precise, resource‑driven security model. By using it to link sensitive resources or protected access paths to stronger authentication requirements, organizations can improve security outcomes while minimizing unnecessary user friction. When applied deliberately and aligned to business‑critical assets, Authentication Context helps close the gap between licensing capability and real‑world value—turning underused Entra ID features into practical, scalable Zero Trust controls.

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