Our log indicates a SAML authn request is being sent via the HTTP-Post binding to the IdP. I suggest using the browser developer tools (F12) to capture the network traffic. You should see an HTTP response containing an HTML form with a SAMLRequest form variable being returned to the browser. There'll also be some JavaScript that automatically submits the form to the IdP. The next item in the network trace should be the HTTP Post of the SAMLRequest to the IdP.
If you don't see this, please check your application code to ensure you're not overwriting the HTTP response. If this is the case, the HTTP response you see should give you a clue as to its origin.
If you do see the SAML request and the destination URL looks correct but the request isn't being received at the IdP, this sounds like a network issue.
Regards ComponentSpace Development
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