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The error means an HTTP GET request is being sent to a Microsoft Entra endpoint that is configured to accept only HTTP POST requests.

To resolve this, adjust the client or application so that it sends a POST instead of a GET to that endpoint:

1. Check the sign-in or token request code
   • If using a browser redirect or link, ensure the form uses method="post" and not get.
   • If using an HTTP client or SDK, change the call from a GET to a POST for that URL.
2. Verify protocol and binding
   • For SAML or similar flows, make sure the binding type and request method match what the application and Microsoft Entra ID expect (for example, HTTP-POST binding must send the SAML message in the POST body, not as query parameters).
3. Retest the flow
   • After changing to POST, repeat the sign-in or API call and confirm the error no longer appears.

If the request is being generated by a third-party app or partner integration, the app owner or vendor must update their integration to use POST for that endpoint.

References:

• "The request sent by client is not signed" error AADSTS76021 in SAML authentication
• OpenID Connect on the Microsoft identity platform
• SharePoint Correlation ID in error messages: what it is and how to use it