Understanding Microsoft Entra ID Authentication in ASP.NET Core

Short summary

Microsoft Entra ID provides cloud-based identity management for ASP.NET Core apps, eliminating local password storage and using OAuth 2.0/OpenID Connect to delegate authentication to Microsoft. Configuration requires app registration, Microsoft.Identity.Web NuGet packages, and tenant/client setup in appsettings.json; the library handles token caching automatically. Most implementation issues stem from configuration errors (redirect URI mismatches, missing permissions) rather than code problems.

• •Entra ID delegates authentication to Microsoft, eliminating password storage in your app
• •OAuth 2.0 handles authorization; OpenID Connect handles identity verification
• •Setup involves app registration, NuGet packages, and configuration; most errors are config-related

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