After auth using SAML page goes blank.

Question

Hi guys so I've been trying to make an outbound firewall authentication with Azure AD as a SAML IdP and I've configured it following this : https://docs.fortinet.com/document/fortigate/7.4.1/administration-guide/33053/outbound-firewall-authentication-with-azure-ad-as-a-saml-idp

The auth works well in itself but I've encountered one issue which is that after the auth is done the search that was made by the user is loads and works but the tab used for the auth goes blank with this link : https://login.microsoftonline.com/kmsi. I've been trying to get rid but can't find a way to.

Thanks for taking the time to read it !

Hope you have the answer.