Step #1: Check Windows updates and LastPass components versions

Please check for updates and install the latest versions of Windows Server updates, LastPass AD Connector, and the LastPass browser extension.

Windows Server updates (including the latest version of .Net Framework)
LastPass Active Directory Connector must be running version 1.2.652 or later – Update now or open the LastPass AD Connector, then go to Home > Check for updates.
The LastPass browser extension must be running the latest version available – Update now .

Parent article: Troubleshooting federated login for Active Directory Federation Services (AD FS)

Next article: Step #2: Check your firewall settings