Directly access the FortiGate via Okta application

Hi,

I am currently working on SAML authentication using OKTA for our fortigate admin accounts and following this KB:

Configuring SAML SSO login for FortiGate ... - Fortinet Community

At the bottom part of it, it mentions:

If a test is performed via Okta Application directly, it will fail with a 'Bad request' error message. That occurs because the SAML assertion does not have the proper payload.

Is there a workaround for this?

We want to directly access the FortiGate via Okta application.

Thank you!