SSO issue: If visits fusion login page first without any action, then IDP-initiated SSO failed

Summary:

SSO issue: If visits the fusion login page first, then in the same browser run IDP-initiated SSO failed, always go back to fusion login page even if successful login

Content (please ensure you mask any confidential information):

Dear All,
Now we successfully config SSO.

SP initiated (Success)

Click the 'Company Single Sign-On' on the Fusion login page, it is a successful login IDP.
URL: https://login-****.oraclecloud.com

IDP initiated (Success)

IDP-initiated SSO login successfully from the customer's platform.
URL: https://login-****.oraclecloud.com/fed/sp/initiatesso?providerid=<****>&returnurl=https://****.oraclecloud.com/homePage/faces/FuseWelcome

Issue (Steps to reproduce the problem)