Azure Won't let me sign in

I've tried both of my emails and get same message

Hello Fletcher Vaughn ,

Thank you for sharing the details. The error AADSTS90023 indicates that the authentication request sent to Microsoft Entra ID was invalid or malformed. This typically happens when required parameters are missing, unsupported properties are included, or the request is incorrectly formatted.

It will occur beacuse of the following:

• Incorrect or missing parameters in the OAuth2/OIDC or SAML request.
• Redirect URI mismatch or not registered in the app configuration.
• Unsupported attributes in SAML requests.
• PKCE parameters (code_challenge/code_verifier) missing or incorrect. Recommended Troubleshooting Steps

Check Sign-In Logs Go to Microsoft Entra admin center → Monitoring → Sign-in logs and filter by:

• Request ID: 7eafe394-c930-4874-a39f-b6332daa9900
  • Correlation ID: 5785b5d4-41e8-462f-8a0c-21cd6325dbcf
    • Timestamp: 2025-11-28T18:58:26Z Review the Authentication Details tab for protocol and error specifics.
    Validate Endpoint and Authority Ensure you are using the correct tenant-specific endpoints:

    - `https://login.microsoftonline.com/{tenant}/oauth2/v2.0/authorize`
    
       - `https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token` Avoid using `consumers` for work accounts.
    
       Confirm Required Parameters
    
          - For OAuth2/OIDC: `client_id`, `response_type`, `redirect_uri`, `scope`, `state`, and PKCE values.
    
             - For SAML: Verify `AssertionConsumerServiceURL`, `Issuer`, and remove unsupported attributes.
    

Check App Registration

• Redirect URIs must match exactly (case-sensitive, no extra slashes).
  • Account type should align with your authority.
  • Permissions and consent should be properly configured.

1. Inspect Request Formatting Use Fiddler or browser DevTools to capture the request and confirm there are no encoding issues or extra whitespace.

Fletcher Vaughn I’m following up on my previous comment as I haven’t received a response. Please let me know if you need any additional information or assistance from my side.