Learn Editor: Update error-code-aadsts500011-resource-principal-not-found.md

Author: custorod

support/entra/entra-id/app-integration/error-code-aadsts500011-resource-principal-not-found.md

@@ -13,4 +13,55 @@ ms.topic:    # Add the ms.topic value
 ms.date:     01/16/2025
 ---
 
-AADSTS500011 - Resource Principal Not Found
+# AADSTS500011 - Resource Principal Not Found
+
+This article describes a problem in which a user receives the error message "AADSTS500011 - The resource principal named [resource URL] was not found in the tenant named [tenant ID]."
+
+## Symptoms
+
+The user receives the error `AADSTS500011` when trying to sign in to an application that has been integrated with Microsoft Entra ID.
+
+## Cause
+
+This error occurs when the resource principal (the application or service) is not found in the tenant. This can happen if:
+1. The resource application has not been provisioned by the administrator in the tenant.
+
+1. The resource application has not been consented to by any user in the tenant.
+
+1. The [resource URL] is not correct.
+
+1. The [tenant ID] is not correct.
+
+## Resolution
+
+To resolve this issue, follow these steps:
+
+1. **Verify Resource Application Provisioning**: 
+
+   - Ensure that the application (resource principal) is registered correctly in your Microsoft Entra ID tenant.
+      
+   - Go to the Azure Portal and navigate to Microsoft Entra > Enterprise Application.
+      
+   - Check if the application is listed and properly configured.
+      
+1. **Consent to the Application**:
+   - Ensure that the resource application has been consented to by an administrator or a user in the tenant.
+      
+   - Go to the Azure Portal and navigate to Microsoft Entra > Enterprise applications.
+   - Find the application and ensure that it has the necessary permissions and consent.
+
+1. **Check [resource URL]**:
+   - Verify if the error message’s [Resource URL] matches the resource application you've provisioned in your tenant ID.
+      
+   - Ensure that the authentication request is sent using the correct [resource URL].
+      
+1. **Check [tenant ID]**:
+   - Verify if the error message’s [tenant ID] is the same as your tenant ID.
+      
+   - Ensure that the authentication request is sent to the correct Microsoft Entra ID tenant.
+      
+## More information
+
+For a full list of authentication and authorization error codes, see [Microsoft Entra authentication and authorization error codes](/azure/active-directory/develop/reference-error-codes).
+
+To investigate individual errors, go to [https://login.microsoftonline.com/error](https://login.microsoftonline.com/error).