User login with SAML authentication at extranet and login SF directly with  Password authentication at internet. So customer need to reconnect session switch with FAS authentication mode and Password authentication mode . This feature worked well in 1912 and now upgrade to 2402 , it couldn't work. There is some feature change in 2402.

The product team has modified the current authentication logic to support switching between different authentication modes. To support this new change ，please Linux vda install 2402Cu3 or later

User use different authentication method , SAML login and Password login in the same connection . But they had the authentication issue.