After upgrading to 4.2.1, when end users are working through the the MFA for a SAML authentication, if the process takes more than 2 minutes users are failing to connect with a "state information lost" error.
PAM 4.2.1
On some chrome based browsers including the PAM Client, the browser is reseting the PHP session id with a 2 minutue time out.
This issue has been resolved with a fix in PAM 4.2.4 and 4.3.1 and higher.