For a long time, Identity and Access Management (IAM) had a very human-centric approach.
Everything revolved around users—employees, contractors, partners—logging into systems, authenticating with passwords, and being governed by policies such as MFA, Conditional Access, and access reviews.
That world is no longer the reality of modern enterprises.
Today, most authentication events across environments are no longer initiated by humans. They are initiated by systems talking to other systems. Applications call APIs. Workloads access databases. Automation pipelines deploy infrastructure. Containers communicate with services. And increasingly, AI agents act autonomously across enterprise systems.
This shift has quietly introduced a new identity reality:
The majority of identities in modern enterprises are no longer human. They are Non-Human Identities (NHI).
And unlike human identities, these identities scale faster, behave differently, and are far harder to govern.
The Identity Shift Nobody Planned For
If you look at a traditional identity environment, the structure seems simple.
There are users, groups, roles, and access policies.
But in a modern Microsoft Entra ID environment, the real activity looks very different.
A business application might include:
- Backend APIs
- Microservices
- Container workloads
- Serverless functions
- CI/CD pipelines
- Monitoring agents
- Integration services
- AI-driven components
Each of these requires authentication.
Each of these requires identity.
And each of these contributes to an identity explosion that most organizations never anticipated.
In many enterprises today, machine identities outnumber human identities by a significant margin—sometimes 20x, 30x, or even more.
The problem is not just scale. It is invisibility and governance.
And this is the key shift:
Identity is no longer about who a person is. It is about what is allowed to act in your environment.
This is where Non-Human Identities come in.
What Is a Non-Human Identity (NHI)?
A Non-Human Identity is any identity that represents a system, service, workload, application, or agent rather than a human user.
In simple terms:
If it needs to authenticate but is not a person, it is a Non-Human Identity.
NHIs include:
- Applications calling APIs
- Automation scripts executing workflows
- Cloud resources accessing storage or databases
- CI/CD pipelines deploying infrastructure
- Containers and microservices communicating internally
- AI agents performing tasks autonomously
- Devices and IoT systems interacting with cloud services
This definition is intentionally broad because modern identity systems are converging.
But what makes NHIs particularly interesting is that they are not a single type of identity. They are an umbrella concept that includes multiple identity models used across Microsoft Entra ID and other cloud platforms.
Understanding the NHI Family in Microsoft Entra ID
Rather than thinking of NHIs as a single concept, it is more accurate to view them as an ecosystem of identity types.
In Microsoft Entra ID, this ecosystem typically includes:
- Service Principals
- Managed Identities
- Workload Identities
- Device Identities
- Agent Identities
These are not competing identity models. They are different representations of non-human actors across different layers of architecture.
Identity Architecture View (Mental Model)
To understand how everything fits together, think of identity as a hierarchy:
This structure is critical because most confusion in IAM comes from treating these as unrelated concepts.
They are not unrelated. They are layers of the same system.
Service Principals – The Application Identity
A Service Principal is the identity of an application inside Microsoft Entra ID.
When an application wants to access Microsoft Graph, read SharePoint data, or interact with Azure resources, it needs to prove its identity. The Service Principal is what makes that possible.
A simple way to understand it is:
A Service Principal is to an application what a user account is to a human.
But in real enterprise environments, Service Principals are far more than just application identities.
They become:
- Integration points between systems
- Authentication anchors for APIs
- Security boundaries for applications
- Targets for privilege assignment
The problem is not their existence—it is their lifecycle management.
Most organizations accumulate thousands of Service Principals over time, many of which:
- No longer have owners
- Retain excessive permissions
- Use long-lived secrets
- Are never reviewed
- Are forgotten after project completion
Over time, this leads to identity sprawl. This creates one of the biggest hidden risks in enterprise IAM.
Managed Identities – Removing the Need for Secrets
Traditional Service Principals require credentials—usually secrets or certificates.
This introduces operational and security challenges:
- Secret rotation complexity
- Expiration failures
- Credential leakage risks
- Manual management overhead
Managed Identities solve this problem by removing credentials from the equation entirely.
A Managed Identity is an identity automatically managed by Microsoft for Azure resources.
Instead of storing credentials, the workload simply requests a token from Azure’s identity system.
This fundamentally changes the security model:
- No secrets stored in code
- No password rotation required
- No credential expiry incidents
- Reduced attack surface
Managed Identities are widely used in:
- Azure Virtual Machines
- Azure Functions
- Logic Apps
- App Services
- Automation Accounts
From a governance perspective, they represent a shift toward platform-managed identity.
Workload Identities – Identity for Running Systems
Workload Identity is one of the most misunderstood IAM concepts.
To understand it properly, you must separate the two ideas:
- Application (what is built)
- Workload (what is running)
An application is static.
A workload is dynamic.
For example:
- A microservice running in Kubernetes is a workload
- A container instance is a workload
- A CI/CD pipeline execution is a workload
- A serverless function execution is a workload
Each of these needs an identity at runtime.
That identity is called a Workload Identity.
Workloads are fundamentally different from traditional applications because they:
- Scale dynamically
- Exist temporarily
- Spawn multiple instances
- Require short-lived authentication
This makes long-lived credentials unsuitable.
Instead, modern workload identity systems rely on:
- Token-based authentication
- Federation mechanisms
- Runtime-bound identity assignment
This is why Workload Identity is becoming a key concept in cloud-native IAM architecture.
Agent Identities – The New Layer of Non-Human Identity
Agent Identities represent the most significant evolution in IAM since cloud adoption.
Unlike traditional applications, AI agents are not strictly deterministic.
They can:
- Make decisions
- Interpret context
- Access multiple systems
- Execute multi-step workflows
- Interact with other agents
- Perform autonomous actions
This introduces a new identity class:
Agent Identity is the identity assigned to an AI system that can act independently within enterprise environments.
For example:
- A Copilot Studio agent retrieving enterprise data
- An AI assistant updating CRM records
- An autonomous agent triggering workflows
- A reasoning model interacting with APIs
This creates a governance challenge that traditional IAM systems were not designed for.
Because now identity is not just about authentication. It is about decision authority.
This is why Microsoft Entra Agent ID is becoming a critical part of the future IAM architecture.
Read More: Microsoft Entra Agent ID
Why Non-Human Identity Governance Matters More Than Ever
Most IAM programs are still human-centric.
But modern breaches increasingly involve machine identities.
Common risks include:
- Forgotten Service Principals with excessive privileges
- Hardcoded secrets in applications
- Over-permissioned workloads
- Unmonitored automation accounts
- Autonomous agents acting without proper governance
The core issue is simple:
Humans are governed. NHIs often are not.
A mature Non-Human Identity governance model should ensure:
- Every identity has an owner
- Every identity has a purpose
- Permissions follow least privilege
- Secrets are eliminated where possible
- Access is continuously monitored
- Identities are regularly reviewed and removed when unused
Non-Human Identity Lifecycle
A typical lifecycle looks like this:
Creation → Assignment → Authentication → Usage → Monitoring → Review → Decommissioning
The weakest point in most organizations is the last stage – decommissioning.
Many Service Principals and workload identities remain active long after their applications are retired.
Frequently Asked Questions (FAQ)
1. Is Managed Identity a type of Service Principal?
Conceptually related, yes. But Managed Identities are fully managed by Azure and eliminate the need for credential management, unlike traditional Service Principals.
2. Are Workload Identities the same as Applications?
No. An application is the software, while a workload is the running instance of that software. Workload Identity represents the runtime execution context.
3. Do AI agents need identities?
Yes. AI agents require identities to authenticate and access enterprise systems securely. These are called Agent Identities.
4. Are devices considered Non-Human Identities?
Sometimes. Devices are non-human entities, but they are usually governed under endpoint management systems rather than IAM workload identity systems.
Final Thoughts
Non-Human Identities are no longer an edge concept in IAM.
They are becoming the dominant identity type in modern cloud and AI-driven enterprises.
Service Principals, Managed Identities, Workload Identities, and Agent Identities are all part of the same evolutionary trajectory.
The organizations that succeed in the next decade will not be those that only secure users.
They will be those that govern every identity—human, machine, workload, and agent—with equal rigor.
Because in the modern identity landscape, everything that acts must have an identity.
And everything that has an identity must be governed.