How to Fix the Azure Auth Token Error: AADSTS500113 No Reply Address is Registered for the Application

How to Fix the Azure Auth Token Error: AADSTS500113 No Reply Address is Registered for the Application

How to Fix the Azure Auth Token Error: AADSTS500113 No Reply Address is Registered for the Application

If you are using Azure Active Directory (Azure AD) to authenticate your users or applications, you may encounter an error message like this:

This error means that Azure AD cannot find a valid reply URL or redirect URI for your application. A reply URL or redirect URI is a location where Azure AD sends the authentication response, which includes a token and some additional information, after a user or an application signs in. You need to register one or more reply URLs or redirect URIs for your application in Azure AD so that it can validate the authentication response and prevent spoofing attacks.

In this post, we will explain how to register and configure reply URLs or redirect URIs for your application in Azure AD, and how to troubleshoot some common issues that may cause this error.

How to register and configure reply URLs or redirect URIs for your application in Azure AD?

To register and configure reply URLs or redirect URIs for your application in Azure AD, you need to follow these steps:

  1. Sign in to the Azure portal and select Azure Active Directory from the left menu.
  2. Select App registrations and then select your application from the list.
  3. Select Authentication from the left menu and then select Add a platform from the Platform configurations section.
  4. Select the type of platform that matches your application, such as Web, Mobile and desktop applications, Single-page application, etc.
  5. Enter one or more reply URLs or redirect URIs for your application in the corresponding field. The format and value of the reply URL or redirect URI depend on the type of platform and the authentication protocol that you use. For example, if you use Web as the platform type and OpenID Connect as the authentication protocol, you need to enter a URL that starts with https:// or http://localhost. If you use Single-page application as the platform type and OAuth 2.0 implicit grant flow as the authentication protocol, you need to enter a URL that starts with https:// or http:// followed by a port number. For more details, see Redirect URI (reply URL) restrictions and limitations.
  6. Select Configure to save your changes.

How to troubleshoot some common issues that may cause this error?

There are some common issues that may cause this error, such as:

  • Mismatch between the reply URL or redirect URI in your application code and in Azure AD: You need to make sure that the reply URL or redirect URI that you use in your application code matches exactly with the one that you register in Azure AD. For example, if you use https://example.com/callback as the reply URL or redirect URI in your application code, you need to register https://example.com/callback as the reply URL or redirect URI in Azure AD. If there is any difference in spelling, case, trailing slash, query string, etc., it will cause this error.
  • Missing or incorrect reply URL or redirect URI parameter in your authentication request: You need to make sure that you include a valid reply URL or redirect URI parameter in your authentication request. The name and value of this parameter depend on the authentication protocol that you use. For example, if you use OpenID Connect as the authentication protocol, you need to include a parameter named redirect_uri with a value that matches one of the reply URLs or redirect URIs that you register in Azure AD. If you omit this parameter or use an incorrect value, it will cause this error.
  • Invalid or expired token: You need to make sure that you use a valid and fresh token in your authentication response. If you use an invalid or expired token, it will cause this error.

To troubleshoot these issues, you can use tools such as Fiddler or Postman to capture and inspect your authentication requests and responses. You can also use Microsoft identity platform developer tools such as jwt.ms or Microsoft Authentication Library (MSAL) to decode and validate your tokens.

Conclusion

Azure AD is a powerful service that enables you to authenticate your users or applications using various protocols and platforms. However, you need to register and configure reply URLs or redirect URIs for your application in Azure AD to ensure that the authentication response is valid and secure. You also need to troubleshoot some common issues that may cause the error: AADSTS500113 No reply address is registered for the application.