Learn Editor: Update error-code-aadsts76021-request-not-signed.md

Author: custorod

support/entra/entra-id/app-integration/error-code-aadsts76021-request-not-signed.md

@@ -0,0 +1,15 @@
+---
+# Required metadata
+# For more information, see https://learn.microsoft.com/en-us/help/platform/learn-editor-add-metadata
+# For valid values of ms.service, ms.prod, and ms.topic, see https://learn.microsoft.com/en-us/help/platform/metadata-taxonomies
+
+title:       # Add a title for the browser tab
+description: # Add a meaningful description for search results
+author:      custorod # GitHub alias
+ms.author:    # Microsoft alias
+ms.service:  # Add the ms.service or ms.prod value
+# ms.prod:   # To use ms.prod, uncomment it and delete ms.service
+ms.topic:    # Add the ms.topic value
+ms.date:     01/14/2026
+---
+H1

support/entra/toc.yml

@@ -106,6 +106,9 @@ items:
           href: entra-id/app-integration/send-notification-details.md
     - name: Troubleshoot sign-in to apps
       items:
+                             - name: Error AADSTS76021 - Request sent by client is not signed
+                               href: ./entra-id/app-integration/error-code-aadsts76021-request-not-signed.md
+                               displayName: AADSTS76021 ApplicationRequiresSignedRequests
         - name: AADSTS7500514 - A supported type of SAML response was not found
           href: entra-id/app-integration/error-code-aadsts7500514-supported-type-saml-response-not-found.md
         - name: Error code AADSTS50173 - The provided grant has expired due to it being revoked