AADSTS50011 Error in Azure AD: What It Means and How to Fix It

Microsoft's Digital Defense Report 2024 highlights the security challenges faced by Entra ID, particularly the AADSTS50011 error, which arises when there's a mismatch between the redirect URI specified in an OAuth 2.0 or OpenID Connect request and the registered URIs in the application’s configuration. This error, which can be a common issue in multi-tenant SaaS environments, requires precise matching of the URI parameters, including case sensitivity, scheme, and port, without any trailing slashes or wildcards for confidential client apps. The guide recommends addressing these mismatches by ensuring the correct URIs are registered in the App Registration settings on the Azure portal, with attention to detail for multi-environment setups. It emphasizes understanding the structure of the redirect URI matching process and the potential complications in multi-tenant applications, where reply URLs are inherited from the home tenant’s App Registration. The document also outlines potential root causes, including unregistered URLs, scheme mismatches, and the restrictive policy on wildcard usage, providing a step-by-step playbook for effectively diagnosing and resolving the AADSTS50011 error.

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