What is DefaultAzureCredential and how does it work?

DefaultAzureCredential is the centerpiece of Azure.Identity that tries multiple authentication methods in sequence — EnvironmentCredential, WorkloadIdentityCredential, ManagedIdentityCredential, VisualStudioCredential, VisualStudioCodeCredential, AzureCliCredential, AzurePowerShellCredential, AzureDeveloperCliCredential, and optionally InteractiveBrowserCredential — allowing the same code to authenticate seamlessly from a developer's machine through to production.

What credential types does Azure.Identity support for different scenarios?

Azure.Identity exposes ManagedIdentityCredential for Azure-hosted workloads, ClientSecretCredential and ClientCertificateCredential for service principals, InteractiveBrowserCredential and DeviceCodeCredential for interactive user sign-in, OnBehalfOfCredential for delegated identity, ChainedTokenCredential for custom fallback chains, and developer credentials (AzureCliCredential, AzurePowerShellCredential, AzureDeveloperCliCredential, VisualStudioCredential) for local development.

How do I integrate Azure.Identity with ASP.NET Core?

Azure.Identity integrates with ASP.NET Core via Microsoft.Extensions.Azure's AddAzureClients and UseCredential methods, enabling dependency injection and environment-based credential selection — such as using ManagedIdentityCredential in production and DefaultAzureCredential in development.

What Azure services does Azure.Identity work with?

Azure.Identity works with any Azure SDK client that accepts a TokenCredential, including Blob Storage, Key Vault, and other Azure services, and supports managed-identity-supporting Azure services like App Service, Functions, AKS, Virtual Machines, and Cloud Shell.

What exceptions does Azure.Identity raise on authentication failure?

Azure.Identity raises AuthenticationFailedException for general authentication errors, CredentialUnavailableException when a credential can't authenticate in the current environment, and AuthenticationRequiredException when interactive authentication is needed.

Skill

Authenticate Securely to Azure Services

Name: Authenticate Securely to Azure Services
Availability: OnlineOnly
Author: Antigravity

Uses Azure.Identity for .NET authentication with DefaultAzureCredential, managed identities, service principals, and developer credentials.

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Updated last month

Source checked Oct 1, 2026

Version 18.10.0

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Why it matters

Streamline authentication to Azure services for your .NET applications. This asset simplifies credential management, enabling secure access to resources like Azure Blob Storage and Key Vault.

Outcomes

What it gets done

Manage service principal secrets and certificates for Azure authentication.

Utilize DefaultAzureCredential for seamless development-to-production credential handling.

Integrate with ASP.NET Core applications using dependency injection for Azure clients.

Configure and debug authentication flows with detailed logging and error handling.

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Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/ag-azure-identity-dotnet | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

A .NET authentication guide covering Azure credential choices, SDK client setup, managed identity, diagnostics, and error handling. Use it when an application or Azure SDK client needs Microsoft Entra ID authentication in .NET.

What it does

Azure.Identity (.NET) is an authentication library for Azure SDK clients using Microsoft Entra ID. The skill explains credential selection for development and production, including DefaultAzureCredential, managed identity, workload identity, environment credentials, service principals, certificates, and developer sign-in. It also covers credential chains, dependency injection, authority hosts, retries, diagnostics, exceptions, and sharing credential instances across clients.

DefaultAzureCredential tries a sequence of environment, workload identity, managed identity, Visual Studio, Visual Studio Code, Azure CLI, Azure PowerShell, Azure Developer CLI, and interactive browser credentials. The guide notes that interactive browser authentication is not enabled by default. It shows how to customize this chain and when to use a more deterministic credential in production. Other examples include ManagedIdentityCredential, ClientSecretCredential, ClientCertificateCredential, ChainedTokenCredential, and developer credentials.

When to use - and when NOT to

Use the library when authenticating .NET applications and Azure SDK clients to Azure services. DefaultAzureCredential supports a common development-to-production flow, while a specific credential can make production authentication more deterministic. Managed identities are described for Azure-hosted applications, and service principal credentials are available for client secret or certificate authentication.

Choose a credential based on the runtime and identity model. Do not treat sample identifiers or secret placeholders as real values. Reuse credential instances, configure retry behavior where needed, and enable Azure Identity diagnostics to investigate authentication failures. When debugging, distinguish CredentialUnavailableException from AuthenticationFailedException to tell whether no credential was available or an attempted credential failed.

Inputs and outputs

Configuration can come from environment variables, managed identity settings, a tenant and client identity, certificate material, or developer tools such as Azure CLI. Applications create a TokenCredential and pass it to Azure SDK clients, including BlobServiceClient and SecretClient. With Microsoft.Extensions.Azure, clients can be registered through dependency injection and configured to use DefaultAzureCredential.

The package installation commands are:

dotnet add package Azure.Identity

# For ASP.NET Core
dotnet add package Microsoft.Extensions.Azure

# For brokered authentication (Windows)
dotnet add package Azure.Identity.Broker

Managed identity environments

Managed identity can run on App Service, Functions, Azure Arc, Cloud Shell, AKS, Service Fabric, Virtual Machines, and Virtual Machine Scale Sets. Select a hosting option that matches the application environment and available identity configuration. The exception reference distinguishes authentication failures, unavailable credentials, and cases that require interactive authentication.

Who it's for

.NET developers building applications that access Azure services can use the guide to choose and configure credentials. It also helps platform engineers standardize authentication for applications running in Azure and troubleshoot authentication failures or unavailable credentials. The exception reference distinguishes failed authentication, unavailable credentials, and cases requiring interactive authentication.

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