AADSTS50011 Error When Signing Into Custom App How Do I Resolve Reply URL Mismatch?

Hello Samuel,

Thank you for posting your questions in the Microsoft Q&A Forum.

The error AADSTS50011: The reply URL specified in the request does not match the reply URLs configured for the application occurs when the redirect URI your application sends during sign-in does not exactly match any of the URIs registered in Microsoft Entra ID.

Steps to Resolve:

1. Check the Redirect URI in Your App Verify the redirect_uri parameter your app is using during authentication (e.g., https://yourapp.com/auth/callback).
2. Update App Registration in Entra ID
   • Sign in to https://entra.microsoft.com.
   • Navigate to App registrations → Select your app → Authentication.
   • Under Redirect URIs, add the exact URI your app uses. Ensure:
   • It matches exactly (including protocol https://, path, and case sensitivity).
   • HTTPS is used (except for http://localhost during development).
3. Add All Required URIs If you have multiple environments (Dev, Test, Prod), add each redirect URI.
4. Save Changes and Restart After updating, save the configuration and restart your app or clear browser cache.

For detailed steps please refer to the document:

https://learn.microsoft.com/en-us/troubleshoot/entra/entra-id/app-integration/error-code-aadsts50011-redirect-uri-mismatch

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